kbhit in C language

kbhit() is present in conio.h and used to determine if a key has been pressed or not. To use kbhit function in your program you should include the header file “conio.h”. If a key has been pressed then it returns a non zero value otherwise returns zero.

// C++ program to demonstrate use of kbhit()
#include <iostream.h>
#include <conio.h>
  
int main()
{
    while (!kbhit())
        printf("Press a key\n");
  
    return 0;
}

Output:

"Press a key" will keep printing on the 
console until the user presses a key on the keyboard.

Note : kbhit() is not a standard library function and should be avoided.

Program to fetch the pressed key using kbhit

// C++ program to fetch key pressed using
// kbhit()
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
    char ch;
    while (1) {
  
        if (kbhit) {
  
            // Stores the pressed key in ch
            ch = getch();
  
            // Terminates the loop
            // when escape is pressed
            if (int(ch) == 27)
                break;
  
            cout << "\nKey pressed= " << ch;
        }
    }
    return 0;
}

Output:

Prints all the keys that will be pressed on
 the keyboard until the user presses Escape key

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