Chapter 5,Problem f: Let Us C

Problem Statement:

Write a C function to evaluate the series 

sin(x) = x − (x 3 / 3!) + (x 5 / 5!) − (x 7 / 7!) +Lto five significant digits.

Solution:

//Ahmad Furqan

//P5.f

#include <iostream>

#include <conio.h>

using namespace std;

int fact(int num)

{

int f = num;

for (int i = num-1; i > 0; i--)

f = f*i;

return f;

}

int pow(int a, int b)

{

int p = a;

for (int i = 1; i < b; i--)

p *= a;

return p;

}

float sin_ser(float ang)

{

float s;

s = ang - (pow(ang, 3) / fact(3)) + (pow(ang, 5) / fact(5)) - (pow(ang, 7) / fact

(7))+(pow(ang,9)/fact(9));

return s;

}

void main(void)

{

float ang;

cout << "Enter an angle: ";

cin >> ang;

cout << "sin(" << ang << ")= " << sin_ser(ang);

_getch();

}