c program for finding sum of series

Question

the given problem statement is Write a C program to calculate the following Sum: Sum=1-x2/2! +x4/4!-x6/6!+x8/8!-x10/10! to sove this i have written the following code

#include<stdio.h>
#include<math.h>
long fact(int);
void main()
{
    int n,x,i;
    float s=0;
    printf("enter the limit\n");
    scanf("%d",&x);
    for(i=0,n=0;i<10;i=i+2,n++)
    s=s+(pow(1,-n)*pow(x,i))/(fact(i));
    printf("the sum of the series is %f\n",s);
}
long fact(int x)
{
    if(x==0)
    return 1;
    else
    return fact(x*fact(x-1));
}

but i am not getting any answer the ouput screen shows

enter the limit
5

but it does not give sum upto 5 terms is a there any other way to solve the problem statement