How to use While loop in c++ | While Loop Structure and Examples in c++

In this post we will discus about the loops and their basic structures.First of all we will discus why we use loop in c++ programming language and other languages like Java, PHP, and C# etc.The basic reason of using loop is to minimize the code and effort of a person to write the code.There are three types of loop in c++ and the one other thing we use is goto statement in c++ that is use as a loop.
The work of the all three loops is same that is to repeat some code in c++ but one thing is different that is the Basic Structure of the loops.Here we first will discus about the WHILE LOOP and its basic structure.That is given bellow.

Syntax :

#include<iostream>

using namespace std; // Header files

void  main()

{ //start of main

       

    int i=1; //this is the starting point of the loop

    while(condition);

     {

           // body of the loop

           i++; //this will increment  in i of 1 after every itration.

     } 

     system("pause");

}//end of main

Example 1 : 

Write a program that take Table no from the use and print table of the given number from 1 to 10 in c++ programming Language.

Solution : 

#include<iostream>

using namespace std; // Header files

void  main()

{ //start of main

     int no;  //this is the variable to take table Nimber from the user.

     int i=1; //this is the starting point of the loop

     cout<<" Enter the Table Number "<<endl;

     cin>>no; 

      while(i<=10);//this is condition of loop

     {

      cout<<no<< " * "<<i<<" = "<<no*i<<endl; // this line print table

           

       i++; //this will increment  in i of 1 after every itration.

     }

     cout<<"\n\n\n"<<endl;

     system("pause");

}//end of main

Example 2 : 

Write a program that take Table number, starting and end point of the table from the use and print table in c++ programming Language.

Solution : 

#include<iostream>

using namespace std; // Header files

void  main()

{ //start of main

           

     int no;  //this is the variable to take table Nimber from the user.

     int st; //this is the starting point of the loop

     int end;//this is the ending point of the loop

     cout<<" Enter the Table Number "<<endl;

     cin>>no; 

     cout<<" Enter the starting point "<<endl;

     cin>>st; 

     cout<<" Enter the Ending Point "<<endl;

     cin>>end; 

      while(st<=end);//this is condition of loop

     {

      cout<<no<< " * "<<i<<" = "<<no*i<<endl; // this line print table

           

       st++; //this will increment  in start of 1 after every iteration.

     }

     cout<<"\n\n\n"<<endl;

     system("pause");

}//end of main

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