Level 6: Summation of fractions ------- C language programming technology (loop structure programming 2)

#include<stdio.h>
	int main(void)
	{  
	  /*********Begin*********/
	  float i,j,t=1,x,sum=0;
	  for(i=1;i<=100;i++)
	  {
		  x=(1/i)*t;
		  sum=sum+x;
		  t=(-t);
	  }
	  printf("%.3f",sum);
	  /*********End**********/ 
       return 0;
	}