#include<stdio.h>
void main()
{
float term,result=1;//累乘项初始值应为1；而累加项初始值应为0
int n;
for(n=2;n<=100;n+=2)
{
term=(float)(n*n)/((n-1)(n+1));
result*=term;
}
printf("result=%f\n",result);

}