编辑代码

#include <stdio.h>
int main () {
   int sum(int n);
   int n,m;
   scanf("%d",&n);
   m=sum(n);
   printf("%d\n",m);
   return 0;
}  
int sum(int n)
{
    int s=0,i=0;
    for(i=2;i<=n;i=i+2)
    s=s+i*i;
    return s;
}