按C键退出时C程序终止

Question

I am a beginner in C. I wrote a C program in Code::Blocks on Windows which will take a int input and print it on the next line. I want to run the loop until I press escape, but I can not do that. My code is:

#include <stdio.h>
#include <conio.h>

int main(void)
{
    int k;
    do {
        scanf("%d",&k);
        printf("%d\n", k);      // print  value
    } while (k != 27);          // end when Esc pressed

    return 0;
}

The loop is working. I input an integer and it prints it on the next line. But it is not terminating by pressing the escape key. There is nothing when I press Escape. I want to run the program until I press the escape, while still accepting int -type inputs from the user. How can I terminate the program on pressing escape?

Answer 1

Check out the function kbhit(); and getch();

A possible solution would be:

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>

int main(){

char ch;
int k;
while (1) {

    if (kbhit) {

        scanf("%d",&k);
        printf("%d\n", k); 

        // Stores the pressed key in ch
        ch = getch();

        // Terminates the loop
        // when escape is pressed
        if (int(ch) == 27)
            break;

    }
}