# Write a program to find the sum of following series 1-X1/1!+X2/2!- …………Xn/n!.

Code:-

#include<stdio.h>
#include<math.h>

// function for finding factorial
int fact(int n)
{
int i,f=1;
for(i=1;i<=n;i++)
f=f*i;
return f;
}

// driver function

int main()
{
int n,sum=1,i,f,X,p;
printf(“Enter the value of X and nn”);
scanf(“%d%d”,&X,&n);
for(i=1;i<=n;i++)
{
f=fact(i);
p=pow(X,i);
if(i%2==0)
sum=sum+(p/f);
else
sum=sum-(p/f);
}
printf(“Sum of the series is: %d”,sum);
return 0;
}

Output:-

Enter the value of X and n
2 3
Sum of the series is: 0