Question

Draw a simplified star-stripe flag using star (*) and equal (=) characters, such as:

****======
****======
****======
****======
==========
========== 
  

The user can choose how the flag should look like. But there are following restrictions:

• The width of the flag is between 5 and 70 (inclusive);
• The height of the flag is between 5 and the width of the flag (inclusive);
• The star area is placed at the upper left corner of the flag;
• The star area is a square and its width must be smaller than the height of the flag;
• There must be at least one star.

Your task:

Design and implement a C++ program that performs the following steps:

• keep asking user to enter the width of a flag until a valid width is entered;
• keep asking user to enter the height of a flag until a valid height is entered;
• keep asking user to enter the width of the star area until a valid number is entered;
• draw (display) the flag based on the user input.

One of the purpose of this assignment is to practice the modular design. Your program should have at least one function that can be used by the first 3 steps of above tasks.

Answer 1

Answer.

Step 1

Program Code:

#include<iostream>
#include<math.h>
using namespace std;
class Flag
{
int flagWidth, flagHeight;
int starArea;
public:
void read() // function to read flag height, width and star area
{
bool valid = false;
do {
// prompt user to enter an int between 5 and 70
cout<<"Enter the flag width (between 5-70): ";
cin>>flagWidth;
// if the number entered is valid, set done to exit the loop   
if (flagWidth >=5 && flagWidth <= 70) {
valid = true;
}
} while (!valid);
valid = false;
do {
// prompt user to enter an int between 5 and flagWidth
cout<<"Enter the flag height (between 5-flagwidth): ";
cin>>flagHeight;
// if the number entered is valid, set done to exit the loop
if (flagHeight >=5 && flagHeight <= flagWidth) {
valid = true;
}
} while (!valid);
valid = false;
do {
// prompt user to enter star area
cout<<"Enter the star area (must be square and smaller than flagHeight): ";
cin>>starArea;
// if the number entered is valid, set done to exit the loop
if (starArea < flagHeight) {
valid = true;
}
} while (!valid);
}
  
void display() // display the output
{
for(int i=1; i<=flagHeight;i++)
{
for(int j=1; j<=flagWidth;j++)
{
if(i<=starArea&&j<=starArea)
cout<<"*";
else
cout<<"=";
}
cout<<endl;
}
}
};
int main()
{
Flag d;
d.read();
d.display();
}

Step 2

Screenshot of code:

Output:

Thank you.