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用c语言做的,不知道为什么不能用"iostream.h"#include<stdio.h>
void main()
{
float sum=0,ave;
float monpay;
int i=1;
for(i=1;i<=12;i++)
{
scanf("%f",&monpay);
sum+=monpay;
}
ave=sum/12;
printf("$%.2f\n",ave);
}
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