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π/2=2/1*2/3*4/3*4/5*6/5*6/7*...

求π

#include <stdio.h>
#include <stdlib.h>

int main()
{
    double term,result = 1.0;
    int n;
    for(n = 2;n <= 100;n = n+2)
    {
        term = (double)(n*n) / ( (n-1)*(n+1) );
        result = result * term;
        //printf("%f\n",result);
    }
    printf("Pi = %f\n",2 * result);
    return 0;
}