Drawing Square and Rectangle Patterns in C Program

Introduction

The C programming language is a procedural programming language. Between 1969 and 1973, Dennis Ritchie worked on the project. It was created primarily as a system programming language for developing operating systems.

In this tutorial we are going to learn to draw or print different variations of Square and Rectangle patterns using C programming language.

In order to understand the code given below you’ve got to have prior knowledge and or understanding of the following topics:

• C for Loop
• C if…..else Statements
• C while Loop
• C break and continue

If you have a sound knowledge and understanding of what the functions of the concepts are then there will be no difficulty in understanding the given codes for square and rectangle patterns in c programming language. With all that said lets get coding!

Square and Rectangle made of *

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

// Square and Rectangle made of *

int main()
{
   int n;

   printf("Enter the number of rows: ");
   scanf("%d",&n);

   for(int r=1; r<=n; r++)
   {
     for(int c=1; c<=n; c++)
     {
       printf("* ");
     }
     printf("\n");
   }

   return 0;
}

Output for Square and Rectangle made of *

Square and Rectangle made of Numbers

Method 1 of making Square and Rectangle made of Numbers

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

// method 1 of drawing square with numbers
// in this case the square is made up of numbers ...
// ... that are in ascending order in the row
int main()
{
   int n;

   printf("Enter the number of rows: ");
   scanf("%d",&n);

   for(int r=1; r<=n; r++)
   {
     for(int c=1; c<=n; c++)
     {
       printf("%3d",c);
     }
     printf("\n");
   }

   return 0;
}

Output for Method 1 of making Square and Rectangle made of Numbers

Method 2 of making Square and Rectangle made of Numbers

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

// method 2 of drawing square with numbers
// in this case the square is made up of numbers ...
// ... that are in ascending order in the column
int main() 
{
   int n;

   printf("Enter the number of rows: ");
   scanf("%d",&n);

   for(int r=1; r<=n; r++)
   {
     for(int c=1; c<=n; c++)
     {
       printf("%3d",r);
     }
     printf("\n");
   }

   return 0;
}

Output for Method 2 of making Square and Rectangle made of Numbers

Square and Rectangle made of Alphabets

Method 1 of making Square and Rectangle made of Alphabets

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

// method 1 of drawing square with alphabets in lowercase 
// In this case the square is made up of alphabets ...
// ... that are in ascending order in the row
int main()
{
   int n;

   printf("Enter the number of rows: ");
   scanf("%d",&n);

   for(int r=1; r<=n; r++)
   {
     for(int c=1; c<=n; c++)
     {
       printf("%3c",c+96);
     }
     printf("\n");
   }

   return 0;
}

Output for Method 1 of making Square and Rectangle made of Alphabets

Method 2 of making Square and Rectangle made of Alphabets

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

// method 2 of drawing square with alphabets in uppercase 
// In this case the square is made up of alphabets ...
// ... that are in ascending order in the row
int main()
{
   int n;

   printf("Enter the number of rows: ");
   scanf("%d", &n);

   for(int r=1; r<=n; r++)
   {
     for(int c=1; c<=n; c++)
     {
       printf("%3c",c+64);
     }
     printf("\n");
   }

   return 0;
}

Output for Method 2 of making Square and Rectangle made of Alphabets

Method 3 of making Square and Rectangle made of Alphabets

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

// method 3 of drawing square with alphabets in lowercase 
// In this case the square is made up of alphabets ...
// ... that are in ascending order in the column
int main()
{
   int n;

   printf("Enter number of rows: ");
   scanf("%d",&n);

   for(int r=1; r<=n; r++)
   {
     for(int c=1; c<=n; c++)
     {
       printf("%3c",r+96);
     }
     printf("\n");
   }

   return 0;
}

Output for Method 3 of making Square and Rectangle made of Alphabets

Method 4 of making Square and Rectangle made of Alphabets

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

// method 4 of drawing square with alphabets in uppercase 
// In this case the square is made up of alphabets ...
// ... that are in ascending order in the column
int main()
{
   int n;

   printf("Enter number of rows: ");
   scanf("%d",&n);

   for(int r=1; r<=n; r++)
   {
     for(int c=1; c<=n; c++)
     {
       printf("%3c",r+64);
     }
     printf("\n");
   }

   return 0;
}

Output for Method 4 of making Square and Rectangle made of Alphabets

Method 5 of making Square and Rectangle made of Alphabets

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

// method 5 of drawing square with alphabets in lowercase and uppercase alternatingly 
// In this case the square is made up of alphabets ...
// ... that are in ascending order in the column
int main()
{
   int n;

   printf("Enter the number of rows: ");
   scanf("%d", &n);

   for(int r=1; r<=n; r++)
   {
     for(int c=1; c<=n; c++)
     {
       if(r%2==0) printf("%3c", r+64);
       else printf("%3c", r+96);
     }
     printf("\n");
   }

   return 0;
}

Output for Method 5 of making Square and Rectangle made of Alphabets

Square Pattern drawn with a border made of *

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

// Square Pattern drawn with a border made of *
// Square Pattern is in a continuous sequence and doesn't start from A every row
// if number of rows is 3 the first row is A B C and the second row is D E F 
// see the output below 

int main()
{
  int n,r,c;
  char ch = 'A';

  printf("Enter number of rows: ");
  scanf("%d",&n);
// using nested loops
  // the outer loop
  for(r=1; r<=n; r++)
  {
    // the inner loop
    for(c=1; c<=n; c++)
    {
      if(c==1||r==1||c==n||r==n) printf("* ");
      else printf("%c ",ch++);
      if(ch > 'Z') ch='A';
    } // the end of inner loop

    printf("\n");
  } // the eend of outer loop

  return 0;
}

Output for Square Pattern drawn with a border made of *