Read number from command line, ignore char.

ReadNumber.c

#include <stdio.h>

int main(int argc, char *argv[])
{
    int input_var = 0;
    int count;

    do {
        printf("Enter a number (-1 = quit): ");
        count = scanf("%d", &input_var);

        if (count == 0 || count == EOF) {
            puts("You entered a non-numeric. Exiting...");
            break;
        }

        if (input_var != -1) {
            printf("You have entered %d\n", input_var);
        }
    } while (input_var != -1);

    puts("All done!");
    return 0;
}