C program to print square or rectangle star pattern

Write a C program to print square star(*) pattern series of N rows. C program to print rectangle star(*) pattern in C of N rows and M columns. Logic to print square or rectangle star pattern of N rows in C programming.

Example

Input

Input number of rows: 5

Output

Required knowledge

Basic C programming, For loop, Nested loop

Logic to print square star pattern

Have a close look to the pattern for a minute so that you can think a little basic things about the pattern.

The pattern is a matrix of N rows and columns containing stars(asterisks). Here, you need to iterate through N rows, and for each row iterate for N columns.

Step by step descriptive logic to print the square number pattern.

  1. Input number of rows from user. Store it in some variable say N.
  2. To iterate through rows, run an outer loop from 1 to N. The loop structure should be similar to for(i=1; i<=N; i++).
  3. To iterate through columns, run an inner loop from 1 to N. Define a loop inside above loop with structure for(j=1; j<=N; j++).
  4. Inside inner loop print *.
  5. After printing all columns of a row move to next line i.e. print a new line.

Let us implement the given pattern in C program.

Program to print square star pattern

/**
 * C program to print square star pattern
 */

#include <stdio.h>

int main()
{
    int i, j, N;

    /* Input number of rows from user */
    printf("Enter number of rows: ");
    scanf("%d", &N);

    /* Iterate through N rows */
    for(i=1; i<=N; i++)
    {
        /* Iterate over columns */
        for(j=1; j<=N; j++)
        {
            /* Print star for each column */
            printf("*");
        }
        
        /* Move to the next line/row */
        printf("\n");
    }

    return 0;
}

Output

Enter number of rows: 5
*****
*****
*****
*****
*****

Hurray! we are done with our first star pattern. Let us modify the above logic to print rectangle star pattern.

Logic to print rectangle star pattern

Step by step descriptive logic to print rectangle star pattern.

  1. Input number of rows and columns from user. Store it in a variable say rows and columns.
  2. To iterate through rows, run an outer loop from 1 to rows. Define a loop with structure for(i=1; i<=rows; i++).
  3. To iterate through columns, run an inner loop from 1 to columns. Define a loop with structure for(j=1; j<=columns; j++).
  4. Inside inner loop print star *.
  5. After printing all columns of a row. Move to next line i.e. print a new line.

Program to print rectangle star pattern

/**
 * C program to print rectangle star pattern
 */

#include <stdio.h>

int main()
{
    int i, j, rows, columns;

    /* Input rows and columns from user */
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    printf("Enter number of columns: ");
    scanf("%d", &columns);

    /* Iterate through each row */
    for(i=1; i<=rows; i++)
    {
        /* Iterate through each column */
        for(j=1; j<=columns; j++)
        {
            /* For each column print star */
            printf("*");
        }
        
        /* Move to the next line/row */
        printf("\n");
    }

    return 0;
}

Output

Enter number of rows: 5
Enter number of columns: 10
**********
**********
**********
**********
**********

Happy coding 😉

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