C Programming Homework Help Needed

[Mike Bortfeldt]

Pat,

It looks like you are not being consistant with the data type for "color". You are inputting it as an integer (%d) so I'll assume you've defined it as such, however you are comparing it in the switch statement as a character. The value '0' will be converted to it's ASCII value (48) for the compare. If 'color' is an integer, then I'd try removing the single quotes from around the numbers in the case statements and see if that works.

Mike

[Pat McCarthy]

Originally Posted by Mike Bortfeldt

Pat,

It looks like you are not being consistant with the data type for "color". You are inputting it as an integer (%d) so I'll assume you've defined it as such, however you are comparing it in the switch statement as a character. The value '0' will be converted to it's ASCII value (48) for the compare. If 'color' is an integer, then I'd try removing the single quotes from around the numbers in the case statements and see if that works.

Mike

Thanks, that did it. I didn't realize that single quotes changed things.

[Pat McCarthy]

I think I need to make this the "Help Pat pass EGR 261" thread.

My problem this time is that a switch statement again.
After the menu displays, the user can enter a selection, but when they hit enter, it just displays a blank line and doesn't leave the switch statement.

Thanks for the continuing help guys.

	int menu_error;
	int menu_selection;

	do
	{
		do
		{
			menu_error = 0;
		
			/* Displays main menu */
			printf("Please select from the following options:\n");
			printf("(1) Draw a colored shape\n");
			printf("(2) Clear graphics window\n");
			printf("(3) Exit\n=>");
			fflush(stdin);
			scanf("%d\n", &menu_selection);

			switch(menu_selection)
			{
				case 1:
					draw_shape();
					break;
					
				case 2:
					clear_graphics();
					break;

				case 3:
					break;

				default:
					menu_error = 1;
					printf("Please enter a selection 1, 2, or 3");
			}
		}
		while(menu_error);
	}
	while(menu_selection != 3);

[Mike Bortfeldt]

Pat,

I'm not sure the problem is in the switch statement. Try removing the \n from the menu_selection scanf line ("%d" rather than "%d\n")

Mike

[Pat McCarthy]

Originally Posted by Mike Bortfeldt

Pat,

I'm not sure the problem is in the switch statement. Try removing the \n from the menu_selection scanf line ("%d" rather than "%d\n")

Mike

That was it! Thanks again!

[Pat McCarthy]

Back again!
I can't figure out how to convert a float value to a char string.
Suggestions? Thanks!

[bear24rw]

Originally Posted by Pat McCarthy

Back again!
I can't figure out how to convert a float value to a char string.
Suggestions? Thanks!

Like take value 9.023 and turn it into '9' '.' '0' '2' '3' in a char string?

Idk how you would get each number individually but to change the number into its ASCII code you would do
# + '0' to get the ascii code of the number

[Pat McCarthy]

Originally Posted by bear24rw

Like take value 9.023 and turn it into '9' '.' '0' '2' '3' in a char string?

Well, I have a float variable that I need to be able to display using WinBGI using the text function that only accepts char strings. So, I really don't know exactly.

[EricVanWyk]

The function you are looking for is called "sprintf".

Use it just like you would use printf to print a float. The trick is that it throws it into a string, rather than at the console.

char * buffer = new char[10];
float f = 12.4;
sprintf(buffer,"%f",f);

I think... I don't have a C compiler in front of me.

[Pat McCarthy]

Is there a header file you need to include?
I'm getting a 'no prototype for function' error for the sprintf function.

[chris31]

Originally Posted by Pat McCarthy

Is there a header file you need to include?
I'm getting a 'no prototype for function' error for the sprintf function.

I believe you need to include stdio.h.

[Pat McCarthy]

Originally Posted by chris31

I believe you need to include stdio.h.

That made that error go away but I still don't really understand how to use the function.
The first line:

char * buffer = new char[10];

is confusing me.

[StormRoBoT]

help on palindrome

i have make a program that can trace palindrome number but i need it to loop over and over again till i keyin -1 then only the program terminate


this is the code that i have used:

#include<stdio.h>
#include<string.h>

void main()
{
char strsrc[5];
char strtmp[5];

printf("\n Enter a five-digit number ( -1 to end ): "); gets(strsrc);

strcpy(strtmp,strsrc);
strrev(strtmp);

if(strcmp(strsrc,strtmp)==0)
printf("\n %s is a palindrome\n",strsrc);
else
printf("\n %s is not a palindrome\n",strsrc);
}

any one can help?

[Alan Anderson]

Originally Posted by StormRoBoT

i have make a program that can trace palindrome number but i need it to loop over and over again till i keyin -1 then only the program terminate

any one can help?

You want it to loop? Hint: use a while statement that never ends, putting all the things inside it that you want to keep executing over and over.

You want it to end? Hint: use an exit statement, but only execute it when the program is supposed to terminate.

[ShotgunNinja]

What exactly do you mean by "loop"? Do you want it to repeatedly ask for a number, then check it for palindrome-ness (sorry, vocabulary suffered a non-Build season hit ) , or do you want to loop through calculations (a bit daft, but I don't know what the professor/employer expects...), or what?