/*
This program will find the sum of Natural
Number/Factorial of Number of all natural numbers from 1 to N.
*/
#include<stdio.h>
/*function to find factorial of the number*/
unsigned long factorial(int num)
{
int i;
/*always assign 1, if variable multiplies with values*/
unsigned long fact=1;
/*multiply num*num-1*num-2*..1*/
for(i=num; i>=1; i--)
fact= fact*i;
/*return factorial*/
return fact;
}
int main()
{
int i,N;
float sum;
/*read value of N*/
printf("Enter the value of N: ");
scanf("%d",&N);
/*set sum by 0*/
sum=0.0f;
/*calculate sum of the series*/
for(i=1;i<=N;i++)
sum = sum + ( (float)(i) / (float)(factorial(i)) );
/*print the sum*/
printf("Sum of the series is: %f\n",sum);
return 0;
}

Enter the value of N: 10
Sum of the series is: 2.718282

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