C Program - Print The Square Star Pattern

This C program prompts the user to input an integer value for the side length of a square and prints a square of asterisks with that side length.  

#include<stdio.h>

int main()
{

    int x, y, side_length;

    printf("Side Length: ");
    scanf("%d",&side_length);

    for(x = 0; x < side_length; x++)
    {

        for(y = 0; y < side_length; y++)
        {
            printf("*");
        }
        printf("\n");
    }

    return 0;
}

Result: 

Side Length: 10
**********
**********
**********
**********
**********
**********
**********
**********
**********
**********

Process returned 0 (0x0)   execution time : 3.099 s
Press any key to continue.

Here is a line-by-line explanation: 

#include<stdio.h>

This line includes the standard input-output header file. 

int main()
{
    int x, y, side_length;

    printf("Side Length: ");
    scanf("%d",&side_length);

This block of code declares three integer variables: x, y, and side_length. It then prompts the user to enter the side length of the square, and the user's input is stored in the side_length variable using the scanf function. 

    for(x = 0; x < side_length; x++)
    {

        for(y = 0; y < side_length; y++)
        {
            printf("*");
        }
        printf("\n");
    }

This block of code uses two nested for loops to print a square of asterisks with side length side_length.

The outer for loop initializes the loop variable x to 0 and increments it by 1 on each iteration as long as it is less than side_length.

The inner for loop initializes the loop variable y to 0 and increments it by 1 on each iteration as long as it is less than side_length. On each iteration of the inner loop, an asterisk is printed using the printf function.

After the inner loop has finished iterating for a given value of x, a newline character is printed using the printf function to move the cursor to the next line. 

    return 0;
}

This line returns 0 to indicate successful execution of the program.