getche function prompts the user to press a character and that character is printed on the screen.
C code for getche
printf("Waiting for a character to be pressed from the keyboard to exit.");
Run this program and press a character. Then view the user screen (Alt+F5) if using Turbo C compiler. You will find the character printed on the screen if you pressed a printable character. Try pressing enter or tab key (non-printable) characters also.