C++ beginers code for Objective-C Developers using XCode

Problem 1: Using CPP code show the use of If…Then…Else statement-using user input values.

Code

//

//  main.cpp

//  Hello World CPP

//

//  Created by Bishal Ghimire on 9/19/13.

//  Copyright (c) 2013 Bishal Ghimire. All rights reserved.

//

#include <iostream>

using namespace std;

/**

   IF then else function for using user input values

*/

int main(int argc, const char * argv[]) {

    int inputAge;

    std::cout << "Input You Age, !\n";

    cin >> inputAge;

   

   

    if (inputAge >= 18) {

        cout << "You can Vote ! \n";

    }

    else if (inputAge < 18) {

        cout << "You can NOT vote ! \n";

    }

    return 0;

}

Output

$ g++ main.cpp

$ ./a.out

Input You Age, !

 29

You can Vote !

Problem 2: Using functions show how you can swipe variables using call by reference.

Code

/**

    Function to swipe two variables using third temp value

 */

void swap(int *u, int *v) {

    int temp;

    temp = *u;

    *u = *v;

    *v = temp;

    return;

}

int main(int argc, const char * argv[]) {

       

    int firstValue;

    cout<<"Input First Value \n";

    cin >> firstValue;

   

    int secondValue;

    cout<<"Input Second Value \n";

    cin >> secondValue;

   

    swap(firstValue, secondValue);

   

    cout<<"First Value and Second Value after they are Swaped \n";

    cout << "1st = " << firstValue << "\n2nd = " << secondValue;

    cout<<"\n";

    return 0;

}

Output

$ g++ main.cpp

$ ./a.out

Input First Value

12

Input Second Value

34

First Value and Second Value after they are Swaped

1st = 34

2nd = 12

Problem 3: Demonstrate the use of functional overloading in CPP (C++)

 Code

/**

  functionOverLoading.cpp

*/

#include "functionOverLoading.h"

using namespace std;

#define pi 3.141

/**

 Function overloading

 */

class fxn {

public:

    void area(int);              // circle

    void area(int, int);         // rectangle

    void area(int, int, int);    // triangle

};

void fxn::area(int a) {

    cout<<"Area of Circle: "<<pi*a*a;

    cout<<"\n";

}

void fxn::area(int a, int b) {

    cout<<"Area of rectangle: "<<a*b;

    cout<<"\n";

}

void fxn::area(int a, int b, int c) {

    // cout<<"Area of triangle: "<<a*b*c;

    cout<<"\n";

}

typedef enum ChoiceType

{

    choiceCircle    = 1,

    choiceRectangle,

    choiceTriangle,

    choiceExit

} ChoiceType;

int main(int argc, const char * argv[]) {

   

    int choice;

    int radius;

    int length;

    int breath;

    int sideA, sideB, sideC;

    fxn object;

   

    cout<<"\n\t\tFunction Overloading";

    cout<<"\n 1. Area of Circle \n 2. Area of Rectangle \n 3. Area of Triangle \n 4. Exit \n ";

    cout<<"Enter your Choice:";

    cin>>choice;

   

    switch (choice) {

        case choiceCircle:

            cout<<"Enter Radious of the Circle:";

            cin>>radius;

            object.area(radius);

            break;

        case choiceRectangle:

            cout<<"Enter Sides of Rectangle:";

            cin>>length>>breath;

            object.area(length, breath);

            break;

        case choiceTriangle:

            cout<<"Enter Sides of triangle:";

            cin>>sideA>>sideB>>sideC;

            object.area(sideA, sideB, sideC);

            break;

        case choiceExit:

            exit(0);

            break;

        default:

            break;

    }

    return 0;

}

Output 

$g++ functionOverLoading.cpp –o functionOverLoading

$ ./functionOverLoading

Function Overloading

 1. Area of Circle

 2. Area of Rectangle

 3. Area of Triangle

 4. Exit

 Enter your Choice:1

Enter Radious of the Circle:10

Area of Circle: 314.1

$ ./functionOverLoading

            Function Overloading

 1. Area of Circle

 2. Area of Rectangle

 3. Area of Triangle

 4. Exit

 Enter your Choice:2

Enter Sides of Rectangle:10 12

Area of rectangle: 120