C Programme for recursive calls to evaluate f(x) = x – x3/3! + x5/5! – x7/7! + ……

A Programme for recursive calls to evaluate f(x) = x – x3/3! + x5/5! – x7/7! + ……

#include<stdio.h>

#include<conio.h>

int main()

{

            float series(float,int),x;

            int n;

            clrscr();

            printf("\nEnter X:");

            scanf("%f",&x);

            printf("\nEnter n:");

            scanf("%d",&n);

            printf("\nAns %f",series(x,n));

            getch();

            return 0;

}

float series(float x,int n)

{

            long factorial(int);

            float power(float,int);

            float sum=0;

            int i,s=1;

            for(i=1;i<=n;i+=2)

            {

                        sum+=(power(x,i)/factorial(i))*s;

                        s*=-1;

            }

            return sum;

}

float power(float x, int y)

{

            float p=1;

            int i;

            for(i=1;i<=y;i++)p*=x;

            return p;

}

long factorial(int p)

{

            long f=1;

            int i;

            for(i=1;i<=p;i++)f*=i;

            return f;

}

/*

******Output******

Enter x : 1.2

Enter n : 5

Ans : 0.932736