#include <stdio.h>
 
#define IMPOSSIBLE_VALUE 42
int print_int_with_blank(char const *pre, int value, char const *post) {
    int n = 0;
    if (value != IMPOSSIBLE_VALUE) {
        n = printf("%s%d%s", pre, value, post);
    }
    return n;
}
 
int main(void) {
    int a[10];
    for (int i = 0; i < 10; i++) {
        a[i] = 7 * i;
    }
    print_int_with_blank("", a[0], "");
    for (int i = 1; i < 10; i++) {
        print_int_with_blank(", ", a[i], "");
    }
    puts("");
}
 
 

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