Nested do while loop in Cpp language

Nested do while loop in Cpp language

In this tutorial, we will learn about Nested do while loop in Cpp  language

In C programming language, one do-while loop inside another do-while loop is known as nested do -while loop

Declaration

Syntax

statements
do{
statements
do{
statements
}while(condition);
statements
}while(condition);

 

Flow diagram of the Nested Do-while loop in C++

How to work Nested do while loop

initially, the initialization statement is executed only once and statements(do part) execute only one. Then, the flow of control evaluates the test expression.

When the test expression is true, the flow of control enters the inner loop and codes inside the body of the inner loop is executed and updating statements are updated. This process repeats until the test expression is false(inner while loop)

Then, when the test expression is false, loop exit from the inner loop and flow of control comes to the outer loop. Again, the flow of control evaluates test condition.

If test condition for outer loop returns as true, the flow of control executes the body of while loop statements and return as false. The flow of control stops execution and goes to rest.

Examples for nested do-while loop

program 1

This program displays a square number pattern in C++

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int i,j;
    i=1;
    cout<<"Square number pattern\n\n";
    cout << "Here your pattern\n" << endl;
    do{
        j=1;
        do{
            cout<<j;
            j++;
        }while(j<=10);
        cout<<"\n";
        i++;
    }while(i<=10);
    getch();
      return 0;
    }

When the above code is executed, it produces the following results:

Square number pattern

Here your pattern

12345678910
12345678910
12345678910
12345678910
12345678910
12345678910
12345678910
12345678910
12345678910
12345678910

 

Program 2

This program displays a square star pattern  using nested- do while loop in C++

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int i,j;
    i=1;
    cout<<"Square star pattern\n\n";
    cout << "Here your pattern\n" << endl;
    do{
        j=1;
        do{
            cout<<"*";
            j++;
        }while(j<=10);
        cout<<"\n";
        i++;
    }while(i<=10);
    getch();
      return 0;
    }

When the above code is executed, it produces the following results:

Square star pattern

Here your pattern

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

Program 3

This program displays Floyd’s triangle number pattern  using nested- do while loop in C++

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int i,j;
    i=1;
    cout<<"Triangle number pattern\n\n";
    cout << "Here your pattern\n" << endl;
    do{
        j=1;
        do{
            cout<<j;
            j++;
        }while(j<=i);
        cout<<"\n";
        i++;
    }while(i<=10);
    getch();
      return 0;
    }

When the above code is executed, it produces the following results:

Triangle number pattern

Here your pattern

1
12
123
1234
12345
123456
1234567
12345678
123456789
12345678910

 

Program 4

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int i,j;
    i=1;
    cout<<"Triangle star pattern\n\n";
    cout << "Here your pattern\n" << endl;
    do{
        j=1;
        do{
            cout<<"*";
            j++;
        }while(j<=i);
        cout<<"\n";
        i++;
    }while(i<=10);
    getch();
      return 0;
    }

 

When the above code is executed, it produces the following results:

This program displays Floyd’s triangle star pattern  using nested- do while loop in C++

Triangle star pattern

Here your pattern

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

 

 

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