//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; }