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Write a program in C to find the sum of the series [ 1-X^2/2!+X^4/4!- .........]. 
Test Data : 
Input the Value of x :2 
Input the number of terms : 5 
Expected Output :
the sum = -0.415873 
Number of terms = 5 
value of x = 2.000000


???????


#include <stdio.h>
void main()
{
    float x,sum,t,d;
    int i,n;
    printf("Input the Value of x :");
    scanf("%f",&x);
    printf("Input the number of terms : ");
    scanf("%d",&n);
    sum =1; t = 1;
    for (i=1;i<n;i++)
    {
      d = (2*i)*(2*i-1);
      t = -t*x*x/d;
      sum =sum+ t;
    }
    printf(" the sum = %f Number of terms = %d value of x = %f ",sum,n,x);