How to use for loop in c++ Programming | For Loop Structure and Examples in c++

In this post we will discus how to use the for loop in c++ programming language.The first thing we discus is that "What is the loop and why we use it?".So the loop is the repetition that is used to repeat the code of c++ language or any  other  language where  the loop is used.For loop is the easiest loop in c++ programming language because here we use the initial point of loop, condition and the increment  in the same brace like ( int a=1; a<=10; a++) here a=1 is the starting point of the loop and a<= is the condition of the loop and a++ is to increment in a..The syntax is given bellow..

Syntax:

#include<iostream>

using namespace std; // Header files

void  main()

{ //start of main

   for( starting point ;  condition ; increment/decrements )

     {

          // body of the for

     }

     system("pause");

}//end of main

The for loop is used a lot in programming.This is also use to print diamond, Triangle, Rectangle, straight, curve and many more shapes in c++ programming. Now here we will discus some shapes.

Example No#1:

Write a c++ program to print the Table of any number from 1 to 10 that is given by the user using for Loop.

Solution:

#include<iostream>

using namespace std; // Header files

void  main()

{ //start of main

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

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

    cin>>no;

   for(int i=1;i<=10;i++)

     {

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

     }

     system("pause");

}//end of main

Example 2 : 

Write a program that take Table number, starting and end point of the table from the user 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 Number 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

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; 

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

     {

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

     }

     system("pause");

}//end of main

Example 3 : 

write a program to print half pyramid in c++ programming Language.

Solution : 

#include<iostream>

using namespace std; // Header files

void  main()

{ //start of main

     int rows;

     cout<<" Enter Number of rows do you want to print "<<endl;

     cin>>rows; // enter the  number of rows do you want to print.

     for(int i=1;i<=rows;i++)

     {

           for(int j=1;j<=i;j++)

           {

                cout<< " * ";

           }

           cout<<endl;

     }

     cout<<"\n\n\n"<<endl;

     system("pause");

}//end of main

Example 4 : 

write a program to print inverted half pyramid in c++ programming Language.

Solution : 

#include<iostream>

using namespace std; // Header files

void  main()

{ //start of main

     int rows;

     cout<<" Enter Number of rows do you want to print "<<endl;

     cin>>rows; // give the  number of rows do you want to print.

     for(int i=rows;i<=1;i--)

     {

           for(int j=1;j<=i;j++)

           {

                cout<< " * ";

           }

           cout<<endl;

     }

     cout<<"\n\n\n"<<endl;

     system("pause");

}//end of main

Example 4 : 

Write a program to print Floyd's Triangle in c++ programming Language.

Solution : 

 #include<iostream>

using namespace std; // Header files

void  main()

{ //start of main

     int Number=1;

     int rows; //veriable decleration

     cout<<" Enter Number of rows do you want to print "<<endl; //message

     cin>>rows; // give the  number of rows do you want to print.

    

     for(int i=1;i<rows;i++) //condition 1

     {

           for(int j=1;j<=i;j++) //condtion 2 that repeat again and again when condition 1 repeat.

           {

                cout<< Number<<"  "; //this line print star.

                ++Number;

           }

           cout<<endl; //move to next line.

     }

     cout<<"\n\n\n"<<endl; //for next line not necessery.

     system("pause");

}//end of main

For More Programs comment your requirement i will create a program.. 



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