count.c

sun 给出的源程序,可用sunstudio或gcc编译.

#include <stdio.h>

void main()
{
  int i,j;
  int a=0;
  double x=0;
  for(i=1;i<50000000;i+=4) { 
    x += 1.0/i - 1.0/(i+2); 
  } 
  printf("Pi %lf\n", x * 4.0); 
 return;
}