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谁帮我看看这代码哪错了#include<stdio.h>
int main()
{
int m,sum,n,a,b;
while(scanf("%d",&m),m)
{
a=0;b=0;
sum=0;
for(int i=2;i<=m/2;i++)
{
n=m-i;
for(int j=2;j<i;j++)
{
if(i%j==0)
{
a=1;break;
}
}
for(int j=2;j<n;j++)
{
if(n%j==0)
{
b=1;break;
}
}
if(a==0&&b==0)
sum++;
}
printf("%d\n",sum);
}
return 0;
}
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