cLanguage math questions

#include <stdio.h>

int main() {

    int A, B, C, D, E, F;

    scanf("%d%d%d\n", &A, &B, &C);
    scanf("%d%d%d", &D, &E, &F);
    printf("%d\n", ((A * 100) + (B * 10) + C) * F);
    printf("%d\n", ((A * 100) + (B * 10) + C) * (E * 10));
    printf("%d\n", ((A * 100) + (B * 10) + C) * (D * 100));
    printf("%d", ((A * 100) + (B * 10) + C) * ((D * 100) + (E * 10) + F));

    return 0;

}