getch() is a nonstandard function and is present in conio. getch() is a nonstandard function and is present in conio. Function getch in C program prompts a user to press a character. putch() and putchar() are used to write a character to screen. getch() function in C: getch() function is a function in C programming language which waits for any character input from keyboard. Well as you know, getch() reads a single byte character from input.