SUMMATION OF EXPONENTIAL SERIES

/*  SUMMATION OF EXPONENTIAL SERIES  */

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

  {

    int x,n,i,prod;

    float t,sum;

    clrscr();

    printf("\n\t\tINPUT:");

    printf("\n\t\t------");

    printf("\n\t\tEnter the value for x:  ");

    scanf("%d",&x);

    printf("\n\t\tEnter the value for n:  ");

    scanf("%d",&n);

    printf("\n\t\tOUTPUT:");

    printf("\n\t\t-------");

    sum=1;

    t=1;

    for(i=1;i<=n;i++)

     {

       prod=i;

       t=t*x/prod;

       sum=sum+t;

     }

    printf("\n\t\tThe value for exp %d is:  %f",x,sum);

    printf("\n\t\tThe built-in value for given value is: 

                                              %f",exp(x));

    getch();

   }

INPUT:

------

Enter the value for x:  1

Enter the value for n:  5

OUTPUT:

-------

The value for exp 1 is:  2.716667

The built-in value for given value is:  2.718282