Thread: Dice Roll

Hi,

I'm trying to write a simple program to roll a die. So far, here is what I have:

Code:

#include <stdio.h>
#include <math.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>

int main(void)
{
	char *roll = "roll";
	char *exit = "exit";
	char input[10];

	printf("Command: ");
	gets(input);

	while((strcmp(input,roll) == 0) && (strcmp(input,exit) != 0))
	{
		printf("%d", 1 + (srand(time(NULL)) % 4));
	}

	return 0;
}

However, when I try to compile, I get an error in line 20 (the print statement) saying "void value not ignored as it ought to be".

Does anyone have any ideas?

Thanks.

> Last edited by seanksg; Today at 06:57 AM. Reason: I solved one of the errors
Which one?

Or were there three to begin with?

Anyway
1. use ==, not =
2. use rand(), not srand() - RTFM for the difference between them.

Oh, and while you're at it, read the FAQ on why gets() is bad.

Originally Posted by Salem

> Last edited by seanksg; Today at 06:57 AM. Reason: I solved one of the errors
Which one?

Or were there three to begin with?

Anyway
1. use ==, not =
2. use rand(), not srand() - RTFM for the difference between them.

Oh, and while you're at it, read the FAQ on why gets() is bad.

Nope, just two. I guess you and I both saw the "==" error at the same time. Andwhy rand()? Won't that produce the same value every time?
Also, thanks for the FAQ suggestion... I was following an example from a textbook, and this, along with a problem I had a while back with the fflush(stdin) function have made me lose a lot of faith in this book, and my professor's ability to choose an appropriate text.

You call srand() exactly ONCE at the start of the program.

Then you call rand() whenever you want.

Did you read the manual?