To calculate value of π

The program

#include<stdio.h>

#include<math.h>

int main()

{

 int i, n;

 float x,pi, sum=0, t=0;

printf("-:PI BY POWER SERIES:- \n\n");

printf("ENTER THE LIMIT UPTO WHICH YOU WANNA EXPAND THE SERIES: ");

scanf("%d",&n);

 for(i=0;i<=n;i++)

{

 t=(pow((-1),i))*(1/float(2*i+1));

sum=sum+t;

}

 pi=4*sum;

 printf(" \nTHE VALUE OF PI IS: %.4f\n", pi);

return 0;

 }