Slip 18 - B) Write a program to calculate sum of following series up to n terms. Sum=X-X 2 /2!+X3 /3!-...... (Note: Write separate user defined function to calculate power and factorial)

Solution:

#include<math.h>

#include<stdio.h>

    int fact(int index)

    {

    int f = 1, i;

    for(i = 1; i <= index; i ++)

    {

        f = f*i;

    }

    return f;

    }

void main()

{

    int x = 1;

    int n = 3;

    double sum = 0,term=-1,   m;

    // Sum of n-1 terms starting from 2nd term

    int i;

    for (i = 1; i <= n; i++) {

        term = term * (-1);

    m =  term * pow(x, i) / fact(i);

    sum = sum + m;

    }

    printf("\n%.4f", sum);

    getch();

}

 (Note: Write separate user defined function to calculate power and factorial)