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求大神指导,代码错在哪里了,为什么sum的结果不对。。。

Posted by liuyuxue at 2015-10-20 21:06:57 on Problem 1004
#include<stdio.h>
int main()
{
  int i;
  double sum=0;
  double a;
  for(i=1;i<=3;i++)
  {
	  scanf("%f",&a);
      sum=sum+a;
  }
   printf("$%.2f",sum/3);
   return 0;
}

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