# Answer to Question #19207 in C++ for Shaza

Question #19207

Create a header file named MyTriangle.h that contains the following two functions:

// return true if the sum of any two sides is greater than the third side//

bool isValid( double side1, double side2, double side3)

//Return the area of a triangle//

double area (double side1, double side2, double side3)

Implement the header file and write a test program that reads three sides of a triangle and compute the area if the input is valid. Otherwise display the input is invalid.

The formula is as follows:

s = (side1 + side2 + side3) / 2;

area = √(s (s-side1)(s-side2)(s-side3))

// return true if the sum of any two sides is greater than the third side//

bool isValid( double side1, double side2, double side3)

//Return the area of a triangle//

double area (double side1, double side2, double side3)

Implement the header file and write a test program that reads three sides of a triangle and compute the area if the input is valid. Otherwise display the input is invalid.

The formula is as follows:

s = (side1 + side2 + side3) / 2;

area = √(s (s-side1)(s-side2)(s-side3))

Expert's answer

#pragma once

class MyTriangle

{

public:

MyTriangle(void);

~MyTriangle(void);

// return true if the sum of any two sides is greater than the third side//

bool isValid( double side1, double side2, double side3) ;

//Return the area of a triangle//

double area (double side1, double side2, double side3);

};

#include "StdAfx.h"

#include "MyTriangle.h"

#include <math.h>

MyTriangle::MyTriangle(void)

{

}

MyTriangle::~MyTriangle(void)

{

}

bool MyTriangle::isValid(double side1, double side2, double side3){

bool flag=false;

if((side1+side2)>side3)

flag = true;

else if((side2+side3)>side1)

flag = true;

else if((side1+side3)>side2)

flag = true;

else

flag = false;

return flag;

}

double MyTriangle::area(double side1, double side2, double side3){

double s = (side1 + side2 + side3) / 2;

double area1 = sqrt(s*(s-side1)*(s-side2)*(s-side3));

return area1;

}

// MyTriangleApplication.cpp : Defines the entry point for the console

application.

//

#include "stdafx.h"

#include "MyTriangle.h"

int main()

{

MyTriangle myTriangle;

if(myTriangle.isValid(5,3,4)){

printf("Area= %f",myTriangle.area(5,3,4));

}

int k;

scanf("%d",&k);

return 0;

}

class MyTriangle

{

public:

MyTriangle(void);

~MyTriangle(void);

// return true if the sum of any two sides is greater than the third side//

bool isValid( double side1, double side2, double side3) ;

//Return the area of a triangle//

double area (double side1, double side2, double side3);

};

#include "StdAfx.h"

#include "MyTriangle.h"

#include <math.h>

MyTriangle::MyTriangle(void)

{

}

MyTriangle::~MyTriangle(void)

{

}

bool MyTriangle::isValid(double side1, double side2, double side3){

bool flag=false;

if((side1+side2)>side3)

flag = true;

else if((side2+side3)>side1)

flag = true;

else if((side1+side3)>side2)

flag = true;

else

flag = false;

return flag;

}

double MyTriangle::area(double side1, double side2, double side3){

double s = (side1 + side2 + side3) / 2;

double area1 = sqrt(s*(s-side1)*(s-side2)*(s-side3));

return area1;

}

// MyTriangleApplication.cpp : Defines the entry point for the console

application.

//

#include "stdafx.h"

#include "MyTriangle.h"

int main()

{

MyTriangle myTriangle;

if(myTriangle.isValid(5,3,4)){

printf("Area= %f",myTriangle.area(5,3,4));

}

int k;

scanf("%d",&k);

return 0;

}

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