nested for loops

This is a discussion on nested for loops within the C Programming forums, part of the General Programming Boards category; I am working on a program that uses nested for loops to display a hollow rectangle from "*". The dimentions ...

  1. #1
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    Angry nested for loops

    I am working on a program that uses nested for loops to display a hollow rectangle from "*". The dimentions are to be specified by user
    I cannot figure how to write the loop to make this retangle hollow. I can only make it solid. This program is for a mandatory class that is not related to my major and my patience is evapotating quickly. Please help if you can.
    Thank you in advance, Ian

  2. #2
    Just one more wrong move. -KEN-'s Avatar
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    try this on for size...

    Code:
    #include <stdio.h>
    
    int main(void)
    {
    	int length, width, x, y;
    
    	printf("Enter length: ");
    	scanf("%d",&length);
    	printf("Enter width: ");
    	scanf("%d",&width);
    
    	for(x = 0; x < width; x++)
    		printf("*");
    
    	printf("\n");
    
    	for(x = 0; x< length; x++)
    	{
    		printf("*");
    		for(y = 0; y< (width-2); y++)
    			printf(" ");
    		printf("*");
    
    		printf("\n");
    	}
    	for(x = 0; x < width; x++)
    		printf("*");
    	return 0;
    }
    would you like me to explain it or an you figure it out?

  3. #3
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    Hi Ken,
    Thank you for your prompt answer to my question. I wonder if you could explain the for loop a little. I think I understand it but I would like to know for sure. Thank you again
    Ian

  4. #4
    Just one more wrong move. -KEN-'s Avatar
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    I'll add in comments where you'll probably want them...

    Code:
    #include <stdio.h>
    
    int main(void)
    {
    	int length, width, x, y;
    
    	printf("Enter length: ");
    	scanf("%d",&length);
    	printf("Enter width: ");
    	scanf("%d",&width);
    
                    /*print out the top row of stars*/
    	for(x = 0; x < width; x++)
    		printf("*");
    
                    /*go to the next line*/
    	printf("\n");
                    /*here's the fun part...*/
    	for(x = 0; x< length; x++)
    	{
                                    /*go all the way down the line and print out both sides...first print out the leftmost character.*/
    		printf("*");
                                    /*now print out spaces al the way to where the right column should be...*/
    		for(y = 0; y< (width-2); y++)
    			printf(" ");
                                    /*...and print out a star in the right column*/
    		printf("*");
                                    /*go to the next line*/
    		printf("\n");
    	}
                    /*print out the bottom row*/
    	for(x = 0; x < width; x++)
    		printf("*");
    	return 0;
    }
    That better?

  5. #5
    Just one more wrong move. -KEN-'s Avatar
    Join Date
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    Posts
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    Here, this way it comes out formatted better:

    Code:
    #include <stdio.h>
    #include <conio.h>
    #include <stdlib.h>
    
    int main(void)
    {
    	int length, width, x, y;
    
    	printf("Enter length: ");
    	scanf("%d",&length);
    	printf("Enter width: ");
    	scanf("%d",&width);
    
    	system("cls");
    
    	for(x = 0; x < width; x++)
    		printf("* ");
    
    	printf("\n");
    
    	for(x = 0; x< length; x++)
    	{
    		printf("* ");
    		for(y = 0; y< (width-2); y++)
    			printf("  ");
    		printf("* ");
    
    		printf("\n");
    	}
    	for(x = 0; x < width; x++)
    		printf("* ");
    
    	printf("\n");
    
    	getch();
    	return 0;
    }

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