原题

源码

//可以使用数组
#include<stdio.h>

int main()
{


    float surplus[12];
    float Avg_Surplus,sum=0.0;
    // surplus为结余，AvgSurplus为平均结余

    for(int i=0; i<12; i++){
            scanf("%f",&surplus[i]);
            sum = sum + surplus[i];

    }
    Avg_Surplus = sum / 12;
    printf("$%.2f",Avg_Surplus);

	return 0;
}



//不使用数组

#include<stdio.h>

int main()
{


    float surplus;
    float Avg_Surplus,sum=0.0;
    // surplus为结余，AvgSurplus为平均结余

    for(int i=0; i<12; i++){
            scanf("%f",&surplus);
            sum = sum + surplus;

    }
    Avg_Surplus = sum / 12;
    printf("$%.2f",Avg_Surplus);

	return 0;
}