Printing pattern in c++

 Printing pattern in c++

#include<iostream>
using namespace std;

int patter_1()
{ //                         Logic              i-1         n-(i-1)
// Pattern 1                  n=5         i     spaces      stars
/*     *****                              1       0          5
        ****                              2       1          4
         ***                              3       2          3
          **                              4       3          2
           *                              5       4          1
*/
    int row;
    cin>>row;
    for (int i =1; i<= row; i++)
    {
      for (int j= 1; j<=row ; j++)
    {
        // stars
        if (j>(i-1))
        cout<<"*";
        else
        cout<<" ";
        
    }

       cout<<endl;
    }
    return 0;
}


int patter_2()
{ //                         Logic           2*(i-1)     n-(i-1)
// Pattern 2                 n = 5     i    spaces      stars
/*  *****                              1       0          5
      ****                             2       2          4
        ***                            3       4          3
          **                           4       6          2
            *                          5       8          1
*/
   int n;
   cin>>n;
   for(int i= 1; i<=n;i++)
   {
       //spaces
        for(int spaces = 1 ; spaces<=2*(i-1) ; spaces++)
          cout<<"  ";
       //stars
        for(int stars = 1 ; stars<= n- (i-1) ; stars++)
          cout<<"* ";
        cout<<endl;   
   }
   return 0;
}

int pattern_4()
{/*
        *
      * *
    * * *
  * * * *
* * * * *
  * * * *
    * * *
      * *
        *
*/
  int n;
  cin>>n;
  for(int i = 1; i<=n*2-1 ; i++)
  {
    for(int j =1; j<=n ; j++)
    {
        // lower spaces
        if (i>n && j<= i-n)
        cout<<"  ";
        // Upper spaces
        else if (j<= (n-i))
        cout<<"  ";
        //stars
        else
        cout<<"* ";
        
    }
    cout<<endl;
  }
  return 0;
}

int patter_5()
{/*
            * * *   * * *
            * *       * *
            *           *

            *           *
            * *       * *
            * * *   * * *
*/
  int n;
  cin>>n;
  int centre = n/2+1;
  for(int row = 1; row<= n; row++)
  {
    
    for(int column = 1; column<= n; column++)
    {
       // Lower stars
        if (row>centre)
        {
          int a = row+centre;
          int b = (row-centre)*2;
          // lower left
          if (column <= row-centre) 
          cout<<"* ";
          // lower right
          else if (column >= a-b)
          cout<<"* ";
          // lower gap
          else
          cout<<"  ";
        }


        // Upper stars
        else if ((column<= centre-row) || (column>= centre+row))
        cout<<"* ";
        else
        cout<<"  ";
    }
    cout<<endl;
  }
  return 0;
}

int pattern_9()
{          /*

*
* *
*   *
*     *
* * * * *

*/
    int n =5;
    cin>>n;
    for(int i= 1; i<= n ; i++)
    {
      for(int j=1 ; j<= i; j++)
      {
        // horizonal vertical diagonal line stars
        if ((i-j==0) || i==n || j==1 )
        cout<<"* ";
        // spaces
        else
        cout<<"  ";
      }
      cout<<endl;
    }
    return 0;
}

int pattern_10()
{                /*
        *
      * *
    *   *
  *     *
* * * * *
                 */
  int n ;
  cin>>n;
  for(int i = 1; i<= n; i++)
  {
    for (int j= 1 ; j <= n ; j++ )
    {
      if ((i+j == 6) || j==n || i==n )
      cout<<"* ";
      else
      cout<<"  ";
    }
    cout<<endl;
  }
  return 0;
}

int pattern_6()
{/*
         1
      1 2 3
    1 2 3 4 5
  1 2 3 4 5 6 7
1 2 3 4 5 6 7 8 9
*/
  int n ;
  cout<<"Enter number of rows"<<endl;
  cin>>n;
  for (int i = 1 , count = 1; i<= n ; i++ ,count = 1) // intializing count=1 after every row and increasing it by 1 when each print statement is running
  {
    for (int j = 1; j<= n*2-1 ; j++)
    {
      if ((j> n-i) &&  (j<n+i))
      {
      cout<<count<<" ";  
      count+=1;
      }
      else
      {
      cout<<"  "; 
      }
                              
    }
    cout<<endl;
  }
  return 0;
}


int pattern_7()
{/*
        1
      2 0 2
    3 0 0 0 3
  4 0 0 0 0 0 4
5 0 0 0 0 0 0 0 5
*/
  int n ;
  cout<<"Enter number of rows"<<endl;
  cin>>n;
  for (int i = 1  , count = 1; i<= n ; i++ , count++) 
  {
    for (int j = 1; j<= n*2-1 ; j++)
    {
      if ((j> n-i) &&  (j<n+i))
      {
      // selecting starting of row to print numbers
      if ((j==(n-i)+1) || (j==n+i-1))
      cout<<count<<" ";
      // between printing zeros
      else
      cout<<"0 ";
      
      }
      else
      {
      cout<<"  "; 
      }
                              
    }
    cout<<endl;
  }
  return 0;
}

int pattern_3()
{/*
        *
      *   *
    *   *   *
  *   *   *   *
*   *   *   *   *

*/
  int n;
  cin>>n;
  for(int i = 1 ,con = 1; i<= n ; i++ , con = 1)
  {
    for (int j= 1; j<= n*2-1 ; j++ )
    {
      //star printing
      if (j>n-i && j<n+i)
      {
        if (con%2 == 0) //if con even print space
        {
        cout<<"  ";  
        }
        else  // else con odd print star
        {
          cout<<"* ";
        }
        con+=1;
      }
      //space printing
      else
      {
      cout<<"  ";
      }

    }
    cout<<endl;
  }
  return 0;
}

int pattern_8()

{
  /*
         0
        909
       89098
      7890987
     678909876
    56789098765
   4567890987654
  345678909876543
 23456789098765432
1234567890987654321          
  */
  int n;
  cin>>n;
  
  for(int i = 1 , count = 1; i<= n+1; i++ , count = 1)
  {
    // left side
    for(int j = 1; j<= n+1 ; j++)
    {
      // print numbers
      if (j>n-i+1)
      {
        if (j==10)
        cout<<0;
        else 
        cout<<count;
      }
      // print spaces
      else
      cout<<" ";
      count+=1;
    }
    // right side
    for (int j = 1 , right_count = 9 ; j<=i-1 ; j++ , right_count-=1)
    {
      // print numbers
      cout<<right_count;
    }
    cout<<endl;
  }
  return 0;
}
int main()
{
  
    
   
    patter_1();
    patter_2();
    pattern_3();
    pattern_4();
    patter_5();
    pattern_6();
    pattern_7();
    pattern_8();
    pattern_9();
    pattern_10();
    
  
    return 0;
}

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