C++ program to print half diamond star pattern

Example

Input :

Input rows : 5

Output :

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

Required Knowledge

Basic C++ programming, for loop, nested loop, if-else

Program to print half diamond star pattern

/**
      C++ program to print half diamond star pattern series.  
*/ 

#include <iostream> 
using namespace std;
int main()
{
     int i, j, N, columns;

     /* Input number of columns from user */
     cout<<"Enter number of columns:";
     cin>>N;
     columns=1;

     for(i=1;i<N*2;i++)
     {
         for(j=1; j<=columns; j++)
         {
             cout<<"*";
         }
         if(i < N)
         {
             /* Increment number of columns per row for upper part */
             columns++;
         }
         else
         {
             /* Decrement number of columns per row for lower part */
             columns--;
         }

         /* Move to next line */
         cout<<"\n";
     }
     return 0;
 }