Usage of Nested loop

Let's see the simple program of printing a number pattern in respective languages.

Program in C

#include <stdio.h>
  int main()
 {
    int i=1,j;
    do
    {
        j=1;
        do
        {
             printf("%d",j);
             printf(" ");
              j++;
         }while(j<=i);
             printf("\n");
              i++;
     }while(i<=5);
    return 0;
}

In this program, nested looping is used to create a number pattern. With each iteration of i, j is executed 'i' times. In 'C language', printf() function is used to print a pattern.

Program in C++

#include <iostream>
using namespace std;
int main()
{
    int i=1,j;
    do
    {
       j=1;
        do
        {
             cout<<j;
             cout<<" " ;    
              j++;
        }while(j<=i);
        cout<<'\n';
          i++;
    }while(i<=5);
    return 0;
}

In this program, i is executed 5 times. Therefore, with each iteration of i, j is executed i times. In C++ language, cout object is used to print the pattern.

Program in C#

using System;
namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args) 
        {
              int i=1,j;
             do
            {
               j=1;
              do
               {
                Console.Write(j);
                Console.Write(" ");
                j++;
            
                }while(j<=i);
           Console.Write('\n');
            i++;
           }while(i<=5);

          
        }
    }
}

In this program, i is executed 5 times. Therefore, with each iteration of i, j is executed i times. In C# language, Console.Write() function is used to print the pattern.

Program in Java

class Rextester
{  
    public static void main(String args[]) 
    {
          int i=1,j;
    do
    {
       j=1;
        do
        {
             System.out.print(j);
             System.out.print(" ");
              j++;
            
        }while(j<=i);
            System.out.println();
          i++;
    }while(i<=5);
  }

In this program, i is executed 5 times. With each iteration of i, j is executed i times. In "java language", System.out.print() is used to print the pattern.

Program in JavaScript

<script>
  var i=1,j;
    do
    {
       j=1;
        do
        {
            document.write(j);
            document.write(" ");
              j++;
            
        }while(j<=i);
      document.write("<br>");
          i++;
    }while(i<=5);
 
</script>

In this program, i is executed 5 times. With each iteration of i, j is executed i times. In javascript, document.write() is used to print the pattern.

Program in Perl

$i=1;
    do
    {
      $j=1;
        do
        {
             printf("$j");
            printf(" ");
       $j=$j+1;
            
        }while($j<=$i);
        printf("\n");
          $i=$i+1;
    }while($i<=5);

In this program, $i is executed 5 times. With each iteration of $i, $j is executed $i times. In perl, printf() function is used to print the pattern.

Program in PHP

<?php //php 7.0.8
 $i=1;
    do
    { 
       $j=1;
        do
        {
           echo $i;
            echo " ";
           $j=$j+1;
            
        }while($j<=$i);
       echo ?\n?;
      $i=$i+1;
    }while($i<=5);
  
?>

In this program, $i is executed 5 times. With each iteration of $i, $j is executed $i times. In PHP, echo keyword is used to print the pattern.

Program in Ruby

$i=1;
  loop  do
      $j=1;
       loop  do
        
             print $j;
             print " ";
             $j=$j+1;
            
            break if($j>=$i)
       end
        print "\n";
          $i=$i+1;
        break if($i>5)
    end

In this program, $i is executed 5 times. With each iteration of $i, $j is executed $i times. In ruby, print keyword is used to print the pattern on the screen.

Program in Swift

var i=1
   repeat
    {
      var j=1
        repeat
        {
             print("\(j)")
            
              j=j+1
            
        }while(j<=i);
        print("\n")
         i=i+1
    }while(i<=5);

In this program, i is executed 5 times. With each iteration of i, j is executed i times. In swift, print function is used to print the pattern.

Output:

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