This program will demonstrate how a hollow square can be printed with the help of the C progrmming language, using nested loops.
Let us start with the headers.
//WinterNurf Productions
#include<stdio.h>
#include<conio.h>
We will now start the main() function and declare two loop control variables for the inner and outer loops.
int main()
{
//Delclare loop control variables
inti = 0;
intj = 0;
We will now declare and initialize a character variable with the ASCII value 219. This character is a block, and gives a better visual impact. Any character may be used instead of this.
//Declare and initialize the character to be displayed
charchBlock = 219;
Now, create the outer loop to iterate rows and print a newline charater inside it. This can also be done after the inner loop.
//Create outer loop to iterate rows
for(i = 0; i < 20; i++)
{
//Give a newline
printf ("\n ");
Now, create an inner loop to iterate columns.
//Create an inner loop to iterate columns
for(j = 0; j < 30; j++)
Since we are printing a hollow square, we will print our character only when the loop variables are at their initial or final values (because these will signify the sides of the square).
//If edge of square, print the character
if(i == 0 || i == 19 || j == 0 || j == 29)
printf ("%c", chBlock);
//If not, print a space character
else
printf (" ");
}
We finally end the program.
_getch();
return 0;
}
Here is the full code.
//WinterNurf Productions
#include<stdio.h>
#include<conio.h>
int main()
{
//Delclare loop control variables
inti = 0;
intj = 0;
//Declare and initialize the character to be displayed
charchBlock = 219;
//Create outer loop to iterate rows
for(i = 0; i < 20; i++)
{
//Give a newline
printf ("\n ");
//Create an inner loop to iterate columns
for(j = 0; j < 30; j++)
//If edge of square, print the character
if(i == 0 || i == 19 || j == 0 || j == 29)
printf ("%c", chBlock);
//If not, print a space character
else
printf (" ");
}
_getch();
return 0;
}
This program has been written in Microsoft Visual Studio for Desktop. It may not work in older compilers. However, simple editing will make the code compatible.
