'display' function

[Unregistered]

This code displays a hollow rectangle from user supplied symbol and parameters. It works perfectly. How could I revise it to use the 'display' function instead.




#include <stdio.h>

int main(void)
{
int inner, outer;// loop control varibles
int length, width;
char icon;// icon is the character that is used for the display

printf("This program draws a hollow rectangle using a character of your choice\n\n");
printf("Choose character for display\n ");
scanf("%c", &icon);
printf("Enter length: ");
scanf("%d",&length);
printf("Enter width: ");
scanf("%d",&width);


for(inner = 0; inner < width; inner ++)// prints top row of icons

printf("%c",icon);

printf("\n");

for(inner = 0; inner < length; inner ++)// prints both sides starting with left
{
printf("%c",icon);

for(outer = 0; outer < (width-2); outer ++)// prints spaces to where the right column should be

printf(" ");

printf("%c",icon);// prints an icon in the right column

printf("\n");
}// end for
for(inner = 0; inner < width; inner ++)// prints bottom row of icons

printf("%c",icon);

printf("\n\n");

return 0;

}

[Salem]

You mean along the lines of

void display ( char icon, int length, int width );

Which you would call from main (after reading in the user input) with
&nbsp; display( icon, length, width );

[Unregistered]

Yes that is what I am talking about.
I get two "unresolved external" faults when trying to run this code. I am not sure where i need to implement the display function. I am definitely missing something.









#include <stdio.h>

void display (char icon, int length, int width);

int main()
{


//int inner, outer;// loop control varibles
int length, width;
char icon;// icon is the character that is used for the display

printf("This program draws a hollow rectangle using a character of your choice\n\n");
printf("Choose character for display\n ");
scanf("%c", &icon);
printf("Enter length: ");
scanf("%d",&length);
printf("Enter width: ");
scanf("%d",&width);


display ( icon, length, width);
}

[Salem]

Yeah, you're meant to write the function as well

void display (char icon, int length, int width) {
    // your looping code here
}

[Unregistered]

Yeah, well I'm not very good with loops either.
This is as close as I could get at this point. It is hard for me to learn this type of thing from a book and a professr who's second launguage is English.
I am getting two, unresolved external faults after building.


#include <stdio.h>

int main(void)
{
int inner, outer;
int length, width;
char icon;// icon is the character that is used for the display

printf("This program draws a hollow rectangle using a character of your choice\n\n");
printf("Choose character for display\n ");
scanf("%c", &icon);
printf("Enter length: ");
scanf("%d",&length);
printf("Enter width: ");
scanf("%d",&width);


for(inner = 0; inner < width; inner ++)

display (icon, width);

printf("\n");

for(inner = 0; inner < length; inner ++)

{
display (icon, length);

for(outer = 0; outer < (width-2); outer ++)


display (" ");

display(icon);

printf ("\n");
}// end for
for(inner = 0; inner < width; inner ++)


display (icon, width);

printf("\n\n");

}

[quzah]

You're misunderstanding how to use functions.
Let's say that my code has this line:

a = b + c;

Assuming I want to move it to a function wich does the same task, how could I do it fairly easy? What is needed? Well, in this case, since we're assigning a value to 'a', I can use a return to give me this. The function needs the values of B and C, so we can provide those via arguments. Thus, my function could look like:

int myFunction( int b, int c ) { return b+c; }

In your case, you want to do the same thing. Move your whole working loop from the original, into a function, and pass it the values it needs to know (size, and character to print).

Quzah.

[Unregistered]

It still has syntax errors and wont compile. Is this any closer to being correct?


#include <stdio.h>

int main()
{

int length, width;
char icon;// icon is the character that is used for the display
const char blank =' ';

printf("This program draws a hollow rectangle using a character of your choice\n\n");
printf("Choose character for display\n ");
scanf("%c", &icon);
printf("Enter length: ");
scanf("%d",&length);
printf("Enter width: ");
scanf("%d",&width);

{
void display( int width, char icon);

display(width, icon);
printf("\n");
{
}
display(int width, int length, char icon, const char ' ');
{
for (length -2)
printf("%c", icon);
display(width -2 ,' ');
printf("%c",icon);
}

display(width, icon);
}
}

[Salem]

Like this

#include <stdio.h> 

void display( char icon, int length, int width );

int main(void) { 
    int length, width; 
    char icon;// icon is the character that is used for the display 

    printf( "This program draws a hollow rectangle using a character of your choice\n\n" ); 
    printf( "Choose character for display\n " ); 
    scanf( "%c", &icon ); 
    printf( "Enter length: " ); 
    scanf( "%d",&length ); 
    printf( "Enter width: " ); 
    scanf( "%d",&width ); 
    display( icon, length, width );
    return 0;
}

void display( char icon, int length, int width ) {
    int inner, outer;// loop control varibles 

    for(inner = 0; inner < width; inner ++)// prints top row of icons 
        printf( "%c",icon ); 

    printf( "\n" ); 

    for(inner = 0; inner < length; inner ++)// prints both sides starting with left 
        { 
        printf( "%c",icon ); 

        for(outer = 0; outer < (width-2); outer ++)// prints spaces to where the right column should be 

            printf( " " ); 

        printf( "%c",icon );// prints an icon in the right column 

        printf( "\n" ); 
    }// end for 

    for(inner = 0; inner < width; inner ++)// prints bottom row of icons 
        printf( "%c",icon ); 

    printf( "\n\n" );
}