UVA - 11945 - FINANCIAL MANAGEMENT

#include <stdio.h>

int main(){
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
    int tc;
    scanf("%d", &tc);
    int tr;
    for(tr = 1; tr <= tc; tr++){
        double income_per_month = 0.0;
        double income_per_year = 0.0;
        double average_income = 0.0;
        int i;
        for(i = 0; i < 12; i++){
            scanf("%lf", &income_per_month);
            income_per_year += income_per_month;
        }
        average_income = income_per_year / 12.0;
//        double fraction, decimal;
//        fraction = modf(average_income, &decimal);
//        int intpart = decimal;
        double thousand = average_income / 1000;

        if(thousand > 0.0){
            int before_commah = average_income/1000;
            double after_commah = average_income - (before_commah*1000);
            printf("%d $%d,%0.2lf\n", tr, before_commah, after_commah);
        }
        else if(thousand <= 0.0){
            printf("%d $%0.2lf\n", tr, average_income);
        }

    }
    return 0;
}