C program for the sum of the series: -1+(1/3!)-(1/5!)+(1/7!)-...n terms

WRITE A C PROGRAM TO FIND THE SUM OF THE FOLLOWING SERIES:
-1+(1/3!)-(1/5!)+(1/7!)-...n terms




#include<stdio.h>
#include<conio.h>
void main()
{
 int i,n;
 float t=-1,s=0;
 printf("Enter the number of terms you want to sum:");
 scanf("%d",&n);
 for(i=0;i<=n;i++)
 {
  s=s+t;
  t=-t/((2*i+1)*(2*i));
 }
 printf("Series: %f",s);
 getch();
}


Output:
   Enter the number of terms you want to sum:2
   Series: -0.833333