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How to c++ asio read full socket data into buffer (C++ Programming Language)

Asked by: Sab Piddington
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Snehal Lawrence (BAND MAKER Technical Support, Industry Experience, Information System, Business Intelligence) From: Bhopal/India
1
std::vector<char> vec(1024);
2
asio::read(socket, asio::buffer(vec));
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Sulakshana Wadhawan, answered


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When you are using "std::" it means that you will grap the following command
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from the "std" namespace.
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The std namespace is an abbreviation for standard
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<?php
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<div contenteditable=true>
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Shachin V.K.Naik answered


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class Name {
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  public:
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#include <sstream>
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int i = 5;
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std::string s;
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std::stringstream out;
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out << i;
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Nasser Lohan answered


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Banita Krishn answered


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#include <future>         // Include future
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function<int(int)> fib =  // Create lambda function
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  [&](int i){
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5
      return 1;
6
    }
7
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8
         + fib(i-2);
9
  };
10
future<int> fut =         // result of async function
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12
// do some other work 
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Vivana Mayer answered


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// i/o example
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#include <iostream>
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using namespace std;
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6
int main ()
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{
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  cout << "Please enter an integer value: ";
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  cin >> i;
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  cout << "The value you entered is " << i;
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  return 0;
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}

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#Answer#

Ratnamala Cowley answered


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// Create a function
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void myFunction() {
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  cout << I just got executed!;
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}
5
int main() {
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  myFunction(); // call the function
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  return 0;
8
}
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// Outputs I just got executed!

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#Answer#

Grzegorz Bedi, answered


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#include <iostream>
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#include <string>
3
4
using namespace std;
5
6
int reverse(int number); // reverses the number's digits
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8
int main() {
9
10
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11
12
    cout << "18475 reversed is " << reverse(18475) << endl;
13
}
14
15
int reverse(int number) {
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19
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        number /= 10;
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    }
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    return result;
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}

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#Answer#

uzfegck Isaac answered


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#include <algorithm>
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#include <string>
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4
void some_func() {
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  std::string s = "example string";
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  std::replace( s.begin(), s.end(), 'x', 'y'); // replace all 'x' to 'y'
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}
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Jeremy Suri, answered


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include_directories(/usr/include/SDL2)
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target_link_libraries(ProjectName /usr/lib/x86_64-linux-gnu/libSDL.so)

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Mim Wadhwa answered


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if (sf::Mouse::isButtonPressed(sf::Mouse::Left))
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{
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4
}
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// get global mouse position
6
sf::Vector2i position = sf::Mouse::getPosition();
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sf::Mouse::setPosition(sf::Vector2i(100, 200), window);

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dnpee HR answered


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Escape sequence Hex value in ASCII  Character represented
2
\a  07  Alert (Beep, Bell) (added in C89)[1]
3
\b  08  Backspace
4
\enote 1    1B  Escape character
5
\f  0C  Formfeed Page Break
6
\n  0A  Newline (Line Feed); see notes below
7
\r  0D  Carriage Return
8
\t  09  Horizontal Tab
9
\v  0B  Vertical Tab
10
\\  5C  Backslash
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\'  27  Apostrophe or single quotation mark
12
\  22  Double quotation mark
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\?  3F  Question mark (used to avoid trigraphs)
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\nnnnote 2  any The byte whose numerical value is given by nnn interpreted as an octal number
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\xhh…   any The byte whose numerical value is given by hh… interpreted as a hexadecimal number
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\uhhhhnote 3    none    Unicode code point below 10000 hexadecimal
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\Uhhhhhhhhnote 4    none    Unicode code point where h is a hexadecimal digit
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                                                        //code by gokul aakash

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Natarajan Bhanmali answered


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#include "stdafx.h"
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#include "calc.h"
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4
void complex_log(double a, double b) {
5
    if (b == 0 && a > 0) {
6
        resultR = ln(a);
7
        resultI = 0;
8
    }
9
    else {
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            resultR = 0; resultI = 0;
12
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13
            resultI = atan2(b, a);
14
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15
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                printf("\nError in function domain.\n\n ==> For complex natural logarithm function the valid domain is [-INF, INF].\n\n");
18
                printf(" ==> Your function argument: ");
19
                complexNumber(a, b);
20
            }
21
        }
22
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23
}
24
25
double ln(double z) {
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    return result1;
29
}

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Matlani wmwvdhd Ahsan answered


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#include using namespace std; int main() {     double leashamt,collaramt,foodamt,totamt;     cout<<"Enter the amount spent for a leash : "; 
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#Answer#

AB yhpcu answered


1
We can think of it as something clear or precise.
2
It is just the opposite of ambihuous i.e. unclear or confusing
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Example Sentences:
4
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#Answer#

Feroz Ayan answered


1
//********************************************************
2
// search algorithm for arrays
3
//********************************************************
4
5
#include <iostream>
6
7
using namespace std;
8
9
void initializeArray(int list[], int listSize);             
10
int seqSearch(int list[], int listLength, int searchItem);      
11
void printArray(int list[], int listSize);                              
12
    
13
int main()
14
{
15
    int maximum = 10;
16
    int array[maximum];
17
    int result;
18
    int input;
19
    
20
    cout << "Enter number to search in array!" << endl;
21
    cin >> input;
22
    
23
    // set all array elements to 1;
24
    initializeArray(array, maximum);
25
    cout << "before change" << endl;
26
    printArray(array, maximum);
27
    
28
    // change array element No. 7 to 0
29
    array[7] = 1;
30
    cout << "after change" << endl;
31
    printArray(array, maximum);
32
    
33
    // search user input in array
34
    result = seqSearch(array, maximum, input);
35
    
36
    if (result = -1)
37
        cout << "Item not found!" << endl;
38
    else
39
        cout << "Item found at position: " << result << "!" << endl;
40
    
41
    return 0;
42
}
43
44
int seqSearch(int list[], int listLength, int searchItem)
45
{
46
    int loc;
47
    bool found = false;
48
    
49
    loc = 0;
50
    
51
    while (loc < listLength && !found)
52
        if (list[loc] == searchItem)
53
            found = true;
54
        else
55
            loc++;
56
    
57
    if (found)
58
        return loc;
59
    else
60
        return -1;
61
}
62
63
void initializeArray(int list[], int listSize)
64
{
65
    int index;
66
    for (index = 0; index < listSize; index++)
67
        list[index] = 0;
68
}
69
70
void printArray(int list[], int listSize)
71
{
72
    int index;
73
    for (index = 0; index < listSize; index++)
74
        cout << list[index] << endl;
75
}
76
77
78
79

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#Answer#

Samuel jdkixxdx Rupam answered


1
Good Website to learn:
2
https://en.cppreference.com/w/cpp/container
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https://www.cplusplus.com/reference/stl/
4
https://www.geeksforgeeks.org/the-c-standard-template-library-stl/

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A.Paul Sarkar answered


1
 UENUM(BlueprintType)
2
 enum class GroundDirection : uint8 {
3
      DOWN = 0 UMETA(DisplayName = DOWN),
4
      LEFT = 1  UMETA(DisplayName = LEFT),
5
      UP = 2     UMETA(DisplayName = UP),
6
      RIGHT = 3 
7
 }

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Dont use in ppt (used in negative sentence)

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Explore the avatar shop to find 
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#Answer#

Esyacode ycmq answered


1
#include <iostream>
2
using namespace std;
3
4
void by_value(int x) {
5
  x *= 2;
6
}
7
8
void by_reference(int &x) {
9
  x *= 2;
10
}
11
12
int main() {
13
  int a1 = 5, a2 = 5;
14
15
  cout << "Before: a1 = " << a1 << ", a2 = " << a2 << "\n";
16
  
17
  by_value(a1);
18
  by_reference(a2);
19
20
  cout << "After: a1 = " << a1 << ", a2 = " << a2 << "\n";
21
22
  return 0;
23
}

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#Answer#

Marie Rajinder answered


1
#include <stdio.h>
2
3
int main()
4
{
5
    int a, b, c;
6
    printf("Enter the first value:");
7
    scanf("%d", &a);
8
    printf("Enter the second value:");
9
    scanf("%d", &b);
10
    c = a + b;
11
    printf("%d + %d = %d\n", a, b, c);
12
    return 0;
13
}
14

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#Answer#

Abanoub iiolms answered


1
#include <iostream>
2
#include <cmath>
3
#include <iomanip>
4
using namespace std;
5
6
#define maximumCount 1000
7
8
int main() {
9
    int n;
10
    cout << "Enter the order of matrix:";
11
    cin >> n;
12
    float A[n][n+1];
13
    float x[n];
14
15
        for(int i=0;i<n;i++){
16
        for(int j=0;j<n + 1;j++){
17
        cout << "Enter matrix at a[" << i << "]" << "[" <<j << "]" << ": " ;
18
        cin >> A[i][j];
19
        }
20
    }
21
22
     //Upper triangular matrux
23
    for(int j=0;j<n;j++){
24
        for(int i=0;i<n;i++){
25
            if(i>j){
26
                float c = A[i][j] / A[j][j];
27
                for(int k=0;k<n+1;k++){
28
                    A[i][k] = A[i][k] - c*A[j][k];
29
                }
30
            }
31
        }
32
    }
33
34
35
        //Dividing each row
36
        for(int i=1;i<n;i++){
37
            float c =  A[i][i];
38
            for(int j=i;j<n+1;j++){
39
                A[i][j] = A[i][j] / c;
40
            }
41
42
        }
43
    for(int i=0;i<n;i++){
44
        for(int j=0;j<n+1;j++){
45
            cout << A[i][j] << " ";
46
        }
47
        cout << endl;
48
    }
49
50
51
52
        x[n-1] = A[n-1][n];
53
54
        //backward substitution loop
55
        for(int i=n-2;i>=0;i--){
56
            float root = A[i][n];
57
            for(int j = i+1; j<n ; j++){
58
                root -= A[i][j] * x[j];
59
            }
60
            x[i] = root;
61
        }
62
        x[0] = x[0] / A[0][0];
63
        for(int i=0; i<n; i++){
64
            cout << x[i] << endl;;
65
        }
66
67
68
69
        return 0;
70
}
71
72

How to print all chrchetrs of a string c++ (C++ Programming Language)

#Answer#

Ranganath Rangaswamy answered


1
#include <iostream>
2
#include <string>
3
4
int main() {
5
  std::string s = "Hello, World!";
6
  
7
  for (int i = 0; i < s.length(); i++) {
8
    std::cout << s[i] << std::endl;
9
  }
10
}

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#Answer#

jovzi Starks answered


1
#pragma comment(linker,"\"/manifestdependency:type='win32' \
2
name='Microsoft.Windows.Common-Controls' version='6.0.0.0' \
3
processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
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#Answer#

Fhulendu Dugal answered


1
All C++ header extensions: .c , .h , .hpp , .hxx , .cpp , .hh
2
C++ file (items / source code): .cpp , .cc , .cxx

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#Answer#

Ric nksw Raushan answered


1
$ conda activate cenv
2
(cenv)$ conda install ipykernel
3
(cenv)$ ipython kernel install --user --name=<any_name_for_kernel>
4
(cenv($ conda deactivate

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#Answer#

Mehar Dips answered


1
// Deletes the second element (vec[1])
2
vec.erase(vec.begin() + 1);
3
// Deletes the second through third elements (vec[1], vec[2])
4
vec.erase(vec.begin() + 1, vec.begin() + 3);

How to sfml draw tex (C++ Programming Language)

#Answer#

Tanushree Chatterjee, answered


1
sf::Text text;
2
// select the font
3
text.setFont(font); // font is a sf::Font
4
// set the string to display
5
text.setString(Hello world);
6
// set the character size
7
text.setCharacterSize(24); // in pixels, not points!
8
// set the color
9
text.setFillColor(sf::Color::Red);
10
// set the text style
11
text.setStyle(sf::Text::Bold | sf::Text::Underlined);
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...
13
// inside the main loop, between window.clear() and window.display()
14
window.draw(text);

How to count number of zeros in array in O(logN) (C++ Programming Language)

#Answer#

Tanko Electronics answered


1
int firstZero(int arr[], int low, int high) 
2
{
3
    if (high >= low) 
4
    { 
5
        // Check if mid element is first 0 
6
        int mid = low + (high - low)/2; 
7
        if (( mid == 0 || arr[mid-1] == 1) && arr[mid] == 0) 
8
            return mid; 
9
        if (arr[mid] == 1)  // If mid element is not 0 
10
            return firstZero(arr, (mid + 1), high); 
11
        else  // If mid element is 0, but not first 0 
12
            return firstZero(arr, low, (mid -1)); 
13
    } 
14
    return -1; 
15
}   
16
// A wrapper over recursive function firstZero() 
17
int countZeroes(int arr[], int n) 
18
{ 
19
    // Find index of first zero in given array 
20
    int first = firstZero(arr, 0, n-1); 
21
    // If 0 is not present at all, return 0 
22
    if (first == -1) 
23
        return 0; 
24
    return (n - first); 
25
} 
26
//Credits : GeeksForGeeks

How to 2 Byte Integer R/W to Arduino’s EEPROM (C++ Programming Language)

#Answer#

dncqe Emil answered


1
#include <EEPROM.h> //Needed to access the eeprom read write functions
2
3
//This function will write a 2 byte integer to the eeprom at the specified address and address + 1
4
void EEPROMWriteInt(int p_address, int p_value)
5
      {
6
      byte lowByte = ((p_value >> 0) & 0xFF);
7
      byte highByte = ((p_value >> 8) & 0xFF);
8
9
      EEPROM.write(p_address, lowByte);
10
      EEPROM.write(p_address + 1, highByte);
11
      }
12
13
//This function will read a 2 byte integer from the eeprom at the specified address and address + 1
14
unsigned int EEPROMReadInt(int p_address)
15
      {
16
      byte lowByte = EEPROM.read(p_address);
17
      byte highByte = EEPROM.read(p_address + 1);
18
19
      return ((lowByte << 0) & 0xFF) + ((highByte << 8) & 0xFF00);
20
      }
21
22
void setup()
23
      {
24
      Serial.begin(9600);
25
      
26
      EEPROMWriteInt(0, 0xABCD);
27
      
28
      Serial.print("Read the following int at the eeprom address 0: ");
29
      Serial.println(EEPROMReadInt(0), HEX);
30
      }
31
32
void loop()
33
      {
34
      }
35

How to how to run a msi file raspbrain (C++ Programming Language)

#Answer#

Suravinda Atwal answered


1
sudo apt install --install-recommends winehq-stable

How to c++ chrono (C++ Programming Language)

#Answer#

Sona Ramachandran answered


1
std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
2
//other stuff
3
std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
4
std::chrono::duration_cast<std::chrono::microseconds>(end - begin).count() 
5
//time difference in microseconds

How to read char from text file c++ (C++ Programming Language)

#Answer#

Krishna Manohar answered


1
#include <iostream>
2
#include <fstream>
3
#include <vector>
4
5
using std::cout; using std::cerr;
6
using std::endl; using std::string;
7
using std::ifstream; using std::vector;
8
9
int main()
10
{
11
    string filename("input.txt");
12
    vector<char> bytes;
13
    char byte = 0;
14
15
    ifstream input_file(filename);
16
    if (!input_file.is_open()) {
17
        cerr << "Could not open the file - '"
18
             << filename << "'" << endl;
19
        return EXIT_FAILURE;
20
    }
21
22
    while (input_file.get(byte)) {
23
        bytes.push_back(byte);
24
    }
25
    for (const auto &i : bytes) {
26
        cout << i << "-";
27
    }
28
    cout << endl;
29
    input_file.close();
30
31
    return EXIT_SUCCESS;
32
}

How to pointers in cpp (C++ Programming Language)

#Answer#

Mikula Siddhesh answered


1
#include <iostream>
2
using std::cout;
3
4
int main() {
5
  /* 
6
  Some things to keep in mind:
7
    -you shouldn't circumvent the type system if you are creating raw ptrs
8
    and don't need to "type pun" or cast (don't use void ptrs)
9
    -ptr types only reference memory (which are integers), not actual data, thus
10
    they should not be treated as data types
11
    char* is just 1 byte of mem, int* is just 4 bytes of mem, etc
12
    - '*' means that you are creating a pointer which "points" to the mem address
13
    of a variable
14
    - '&', in this case, means "get the mem address of this variable"
15
  */
16
  
17
  void* ptr; // a pointer that doesn't reference a certain size of memory
18
  int* int_ptr; // a pointer that points to data with
19
                // only 4 bytes of memory (on stack)
20
  
21
  int a = 5; // allocates 4 bytes of mem and stores "5" there (as a primitive)
22
  ptr = &a; // can only access the memory address of 'a' (not the data there)
23
  
24
  int b = 45; 
25
  int_ptr = &b; // can access both memory address and data of 'b'
26
  
27
  cout << ptr << "\n"; // prints mem address of 'a'
28
  /*cout << *ptr << "\n"; <- this will error out; a void ptr cannot be 
29
                             derefrenced */
30
  cout << *(int*)ptr << "\n"; // type punning to get around void ptr (extra work)
31
  
32
  cout << int_ptr << "\n"; // mem address of b
33
  cout << *int_ptr << "\n"; // data stored at b
34
  
35
  /* -- OUTPUTS -- */
36
  /*
37
    some memory address (arbitrary) which contains 05 00 00 00 as its data
38
    5
39
    some memory address (arbitrary) which contains 2D 00 00 00 as its data
40
    45
41
  */
42
  
43
  return 0; // you only need this if "main" isnt the linker entry point
44
            // you also don't care
45
  
46
  // ur also probably wondering why I didn't using namespace std... cherno
47
}

How to subset sum problem using backtracking python (C++ Programming Language)

#Answer#

Navagat Binojee answered


1
def SubsetSum(set, n, sum) :
2
   # Base Cases
3
   if (sum == 0) :
4
      return True
5
   if (n == 0 and sum != 0) :
6
      return False
7
   # ignore if last element is > sum
8
   if (set[n - 1] > sum) :
9
      return SubsetSum(set, n - 1, sum);
10
   # else,we check the sum
11
   # (1) including the last element
12
   # (2) excluding the last element
13
   return SubsetSum(set, n-1, sum) or SubsetSum(set, n-1, sumset[n-1])
14
# main
15
set = [2, 14, 6, 22, 4, 8]
16
sum = 10
17
n = len(set)
18
if (SubsetSum(set, n, sum) == True) :
19
   print("Found a subset with given sum")
20
else :
21
   print("No subset with given sum")

How to dinamica02 pbinfo (C++ Programming Language)

#Answer#

Verger lkfvuct Martin answered


1
#include <iostream>
2
3
using namespace std;
4
5
#define MOD 777013
6
7
int n;
8
long long s[2], nr;
9
10
int main()
11
{
12
    cin >> n;
13
    s[0] = 26; s[1] = 26 * 26;
14
    for (int i = 3; i <= n; ++ i)
15
    {
16
        nr = (s[1] * 25 + s[0] * 25) % MOD;
17
        s[0] = s[1];
18
        s[1] = nr;
19
    }
20
    cout << nr;
21
    return 0;
22
}

How to what is difference between ciel and floor (C++ Programming Language)

#Answer#

Khani Kondaji answered


1
Ceil (short for ceiling) and floor function are both mathematical 
2
functions. ... For example, ceil function returns the least value 
3
of the integer that is greater than or equal to the specified number.
4
On the other hand, floor function gets the greatest value that is
5
less than or equal to the specified number.

#Answer#

Carson otlv answered


1
Arrays.sort(myArr, (a, b) -> a[0] - b[0]);

#Answer#

Hendricks Aswinkumar answered


  1. Check Your Attitude. "Attitude is very important," says employment consultant Rick Waters.
  2. Be Reflective.
  3. Assess Your Performance Against the Job Specifications.
  4. Keep a File.
  5. Find out the Supervisor's Expectations.
  6. Get Feedback From Others.
  7. Be a Team Player.
  8. Plan Ahead.

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