9. Write a program to generate sum of series 1!+2!+3!+--------------n!

 SOURCE CODE:

Method 1...

#include <stdio.h>

int fact_sum(int n)

{   int i,c;

    int sum=0,f=1;

    for(i=1; i<=n;i++) {

    f= f*i;

    sum+=f;

    printf("%d!",i);

    if(n!=i){

        printf("+");

    }

    }

    return sum;

}

int main()

{   int n,c;

    printf("enter the value of n\n");

    scanf("%d",&n);

    printf("=%d",fact_sum(n));

    return 0;

}

Method 2...

#include <stdio.h>

int fact(int n)

{ if(n==1 || n==0)

  return 1;

  else

  return n*fact(n-1);

}

int fact_sum(int n)

{   int i,c;

    int sum=0;

    for(i=1; i<=n;i++) {

    c= fact(i);

    sum+=c;

    }

    return sum;

}

int main()

{   int n,c;

    printf("enter the value of n\n");

    scanf("%d",&n);

    printf("sum of factorials is %d",fact_sum(n));

    return 0;

}