#include <stdio.h>
#include <math.h>
#define PI 3.14159265359

double function(int N);

 

int  main(double function(int N))
{
   printf("N=10, sum=%lf\n\n", function(10));
   printf("N=50, sum=%lf\n\n", function(50));
   printf("N=100, sum=%lf\n\n", function(100));
   printf("N=500, sum=%lf\n\n", function(500));
   printf("N=1000, sum=%lf\n\n", function(1000));
   printf("N=5000, sum=%lf\n\n", function(5000));
   printf("N=10000, sum=%lf\n\n", function(10000));
   printf("N=50000, sum=%lf\n\n", function(50000));

}

 

double funtion(int N)
{
   int  i;
   double sum;
   double root = 1;

   for (i = 2; i <= N; i++)
   {
      double root = ((PI / 2) / N);
      sum = root*sin(root);
      sum += root*sin(root*i);
   }
   return N;

}

 

main함수에 프린트엪 한 것처럼 출려하고싶은데.. c언어잦밥이라 모르겠어요..