Cpp program to print diamond star pattern

In this tutorial, we will discuss Cpp program to print diamond star pattern.

In this post, we display two diamond patterns using nested for loop and nested while loop in C++ language

Cpp program to print star diamond pattern — Diamond Star Pattern

In the first program, we are going to learn how to displayed diamond star pattern using for loop or nested for loop in C++ programming language

here, we display a diamond pattern program with coding using nested for loop and also we get input from user using Cin in C++ language

the user can provide numbers as they wish and get the Diamond star pattern according to their input

Program 1

diamond star pattern 1

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int rows,i,j,Num_Of_space=1;
    cout<<"Enter the number of rows: ";
    cin>>rows;

    Num_Of_space=rows-1;

    for(i=1; i<=rows; i++){ //outer for loop 1
        for(j=1; j<=Num_Of_space; j++)//inner for loop for space
            cout<<" ";
            Num_Of_space--;

        for(j=1; j<=2*i-1; j++)//inner for loop for star
            cout<<"*";

        cout<<"\n";

    }

    Num_Of_space=1;
    for(i=1; i<=rows-1; i++){//outer for loop 2
            for(j=1; j<=Num_Of_space; j++)
            cout<<" ";//inner for loop for space
    Num_Of_space++;

        for(j=1; j<=2*(rows-i)-1; j++)//inner for loop for star
            cout<<"*";
            cout<<"\n";//move to next line

        }
        getch();

    return 0;
}

When the above code executed, it produces the following results

Enter the number of rows: 6
          *
        ***
      *****
    *******
  *********
***********
  *********
    *******
      *****
        ***
          *

Diamond pattern using while loop

In the second program, we are going to learn how to displayed diamond star pattern using while loop or nested while loop in C++ programming language

here, we displayed a diamond pattern program with coding using nested while loop and also we get input from user using Cin() function in C++ language

the user can provide numbers as they wish and get the Diamond star pattern according to their input

Program 2

diamond star pattern 2

#include <iostream>
#include <conio.h>

using namespace std;

int main()
{
    int i=1,j=1,rows;

    cout<<"Enter the mnumber of rows\n";
    cin>>rows;
    int space=rows-1;
    while(j<=rows){  //outer while loop 1
        cout<<"\n";
        j=1;
        while(j<=space){ //inner while loop for space
            cout<<" ";
            j++;
        }
        j=1;
        while(j<=2*i-1){//inner while loop for star
            cout<<"*";
            j++;
        }
        i++;
        space--;
    }
    i=rows-1;
    space=1;
    while(i>=1){   //outer while loop 2
        cout<<"\n";
        j=1;

        while(j<=space){  //inner while loop for space
            cout<<" ";
            j++;
        }
        j=1;
        while(j<=2*i-1){//inner while loop for star
            cout<<"*";
            j++;
        }
        i--;
        space++;
        }
        getch();
    return 0;
}

When the above code executed, it produces the following results

Enter the number of rows: 6
          *
        ***
      *****
    *******
  *********
***********
  *********
    *******
      *****
        ***
          *

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