Question

Develop a complete C++ program that will calculate draw an empty cube rectangle using a function call. A rectangle is identified by length of its edges, 2 <= L <= 20. Implement a function to perform user request, which requires two parameter. The functions you define should not return a value. In main() function, design a loop to ask user to enter length of edges until user enters 0 for one of the edges. A length of 0 exits the program. An example run is given below:

Enter length of the edges: 5 4

* * * * *
*       * 
*       *
* * * * *

Enter length of the edges: 6 3

* * * * * *
*         *
* * * * * * 

Enter length of the edges: 2 3

* *
* *
* *

Enter length of the edges: 0 9

Bye...

Answer 1

I think the output you provided in the example is wrong as in first case the second and third row stars end one column earlier , same in the second example the middle row ends one column earlier.

It should have been like this:

Though I have implemented both the cases, In the code below drawRectangle(int ,int) is for drawing as I mentioned in the image above and drawRectangle1(int,int) is as you have given the screenshot. Uncomment drawRectangle1(int,int) function call in main() function to check it .

Code Screenshot

Output:

This is if you use the drawRectangle(int ,int) method

This is if you use the drawRectangle1(int ,int) method

Code:

#include<iostream>

using namespace std;

//output is as I mentioned in the answer

//drawrectangle(int,int) method

//takes two integer parameters which are length of the edges

void drawRectangle(int l,int b){

    //the first outer loop keeps track of the breadth of the rectnagle

    for(int i=1;i<=b;i++)

    {

        //this inner loop is for length of the rectangle

        for(int j=1;j<=l;j++)

        {

            //this is for the first and last row case of the rectangle

            //in this case stars are entered continously till teh entire length

            if(i==1 || i==b){

                cout<<"*";

            }

            //this is for all the middle rows of teh rectangle(except the first and last)

            //in this case star is printed only at the first and last column

            else{

                //if it is the first or last column then only print the star

                //else print a blacnk space

                if(j==1 || j==l)

                    cout<<"*";

                else

                    cout<<" ";

            }

        }

        //after row is done move to next line

        cout<<"\n";

    }

}

//output is asper your question , which I think is incorrect

//drawrectangle(int,int) method

//takes two integer parameters which are length of the edges

void drawRectangle1(int l,int b){

    //the first outer loop keeps track of the breadth of the rectnagle

    for(int i=1;i<=b;i++)

    {

        //this inner loop is for length of the rectangle

        for(int j=1;j<=l;j++)

        {

            //this is for the first and last row case of the rectangle

            //in this case stars are entered continously till teh entire length

            if(i==1 || i==b){

                cout<<"*";

            }

            //this is for all the middle rows of the rectangle(except the first and last)

            //in this case star is printed only at the first and second last column

            else{

                //if it is the first or second last column then only print the star

                //else print a blacnk space

                if(j==1 || j==l-1)

                    cout<<"*";

                else

                    cout<<" ";

            }

        }

        //after row is done move to next line

        cout<<"\n";

    }

}

int main(){

    //local varibales for storing the length of the edges

    int l,b;

    //this loops runs continuosly

    while(true)

    {

        //ask user to enter the lengths of the edges

        cout<<"\nEnter length of the edges : ",

        cin>>l>>b;

        //if any one of the edge length =0 show Bye msg and break the loop

        if(l==0 || b==0)

        {

            cout<<"Bye...";

            break;

        }

        else    //else make function call to drawrectangle(int,int) method

        {

            //function which draws the rectangle as I mentioned in the answer

            drawRectangle(l,b);    

            //function which draws the rectangle as you mentioned in the question

            //uncomment the below function and comment the fucntion call above to check it

            

            //drawRectangle1(l,b);    

        }

        

    }

}