The while and do

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while(condition-expression)
{
    statement1;
}

break statement

int main()
{
    int x = 0;
 
    while (x < 10)
    {
        if(x > 5)
        {
            break;
        }
 
        cout << x << endl;
 
        x++;
    }
    return 0;
}

continue Statement

int main()
{
    int x = 0;
 
    while (x < 10)
    {
        x++;
 
        if(x < 5)
        {
            continue;
        }
 
        cout << x << endl;
    }
 
    return 0;
}

while loop is like a pre-paid service

do-while loop

do
{

    statement1 ;

}while(condition-expression);

while loop

#include<iostream>
#include<cstdio>
 
using namespace std;
 
int main()
{
    cout << "Proceed?[y/n]: "; 
            
    char ansr; 
         
    cin >> ansr;
         
    while ('y' == ansr || 'Y' == ansr)
    {
        cout << "Enter a number: " << endl;
             
        int num; 
                
        cin >> num; 
                  
        cout <<"Square is = " << num * num << endl; 
                 
        cout << "Continue?[y/n]: ";
             
        cin >> ansr;
    }
 
    cout << "Quitting..." << endl;
 
    return 0;
}
 

 

while loop - Odd number series

#include<iostream> 
#include<cstdio> 
 
using namespace std ;
 
 
int main() 
{
      
    int i = 1; 
      
    while( i < 100 )
    {
          
        int a = i % 2;
              
        if( 0 != a )
        { 
               
            cout << i << endl;
                   
        }
            
        i++;
            
    }
     
    return 0;
      
}

Alternate Solution

int main()
{
    int i = 0; 
 
    while( ++i < 100 )
    {
        if( i % 2 )
        { 
            cout << i << endl;
        }
    }
 
    return 0;
}

while loop - Series

#include<iostream> 
#include<cstdio> 
 
using namespace std ;
 
 
int main() 
{
 
      
    int i = 5;
    
    while( i >= 1)
    {
        
        printf( "%d\n" , i * i * i );
    
        i = i - 1;
    
    }
 
    return 0;
      
}

do-while

#include<iostream>
#include<cstdio>
 
using namespace std;
 
int main()
{        
    char ansr; 
         
    do
    {
        cout << "Enter a number: " << endl;
             
        int num; 
                
        cin >> num; 
                  
        cout <<"Square is = " << num * num << endl; 
                 
        cout << "Continue?[y/n]: ";
             
        cin >> ansr;

    }while ('y' == ansr || 'Y' == ansr);
 
    cout << "Quitting..." << endl;
 
    return 0;
}
 

 

while loop - Reverse a number

#include<iostream> 
#include<cstdio> 
 
using namespace std ;
 
int main() 
{      
    int r, n, b;
 
    b = 0;
    
    cout << "Enter number";
    
     cin >> n;
 
    while (n > 0)
    {
    
        r = n % 10;
    
        n = n / 10;
    
        b = ( b * 10 ) + r;
 
    }
 
    printf("%d",b);
 
    return 0;
      
}

A Shorter and Alternate Solution

int main()
{
    cout << "Enter a positive number:";
    
    int n;
 
     cin >> n;
 
    int result = 0;
 
    do
    {
 
        (result *= 10) += (n % 10);
 
    }while (n /= 10);
 
    cout << result << endl;
 
    return 0;
}

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