Question

#include <stdio.h>

// copy input to output
// my version

int main()
{
    int c;

    printf("\n\nUse CONTROL + D to terminate this program\n\n");

    while ((c = getchar()) != EOF) {
        putchar(c);
    }

    if ((c = getchar()) == EOF) {
        printf("\n\nProgram TERMINATED\n\n");
    }

    return 0;
}

When I enter control + D, the body of the if statement runs. That’s what I had wanted, but as I analyzed the code more thoroughly, shouldn’t it ask for my input again since the if‘s condition is (c = getchar()) == EOF?

Answer 1

When you hit ^D, input to the program is closed, so getchar() will subsequently always return EOF.