Thread: Bubble sort algorithm help please, in C

Originally Posted by BenBusby

Forth line:
int index; ?

int index declares a variable called index but does not assign an initial value. The first part of a for loop is intended to assign the initial value. For example, to count from 1 to 10 we do this

for (i=1; i <= 10; i++)
printf("%d\n", i);

Also, when you compile try to turn on warnings in your compiler and fix all of them. In your code you have some other things that should be caught by the compiler, for example:

text= ("The two of");

You made text an `int' variable and are trying to assign a string constant to it.

text=text+" Clubs";

Same here. You cannot add strings together in C in any meaningful way. For string concatenation there is `strcat'.

There are freely downloadable compilers that don't have such restrictions. A popular one is GCC with Codeblocks. As I recall, it shows you all warnings by default.

To concantate text look for the man page of strcat. For example search on "man 3 strcat" and you will find the answer. Or, you can find a way to accomplish what you're trying to do without string concatenation. For example

printf("Hello, ");
printf("world!");

this will effectively concatenate the strings in your output. There's no need to store them.

Originally Posted by BenBusby

We need to use the compiler provided by the lecturer.

No, you can use whatever compiler you want. As long as your end result compiles with the compiler provided by your lecuturer.

Originally Posted by BenBusby

"Each student must submit their coursework by writing to their assigned coursework page at the website"

Does it say in the rules that students may submit their source code to web forums so that the people on the web forum can run it through their compilers and find the warnings for them?

If you don't want to run the recommended checks yourself then that's your call, but there are good reasons to do it. Just because your prof didn't suggest it is not a good reason not to and it's clearly not forbidden by the rules to do so.

Originally Posted by BenBusby

The online compiler will pick up mistakes like missing ';' or expected terms that aren't there, can it improve much on that?

It can, by assuming some of the functionality of a static analysis tool rather than a mere compiler. This is what is typically done by a compiler that you might install yourself, with warnings turned on at a high level. Of course, such static analysis falls short of the scope of a dedicated tool, but then that is not the primary purpose of a compiler to begin with. So, use an offline compiler to help you.