C Program Sum Factorial Series

By | March 11, 2020

C Program Sum Factorial Series

/*
  C program to calculate and print 
  sum of the series 1!+2!+3!+...+n!
  C program to print the sum of 
  factorials of natural numbers 
  from 1 to n.
  */
 
#include<stdio.h>
     
int main()
{
    int i,n,sum;
	long fact=1;
     
    printf("Enter the value of n: ");
    scanf("%d",&n);
     
    sum=0;
     
    /* loop to calculate sum from 1 to n*/
    for(i=1;i<=n;i++)
        {
		fact = fact * i;
		sum= sum+ fact;
		}
     
    /*display the sum on screen*/
     
    printf("The Sum of the series 1!+2!+3!+...+%d! is: %d\n",n,sum);
     
    return 0;
}


Output
Enter the value of n: 5
The Sum of the series 1!+2!+3!+…+5! is: 153

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