C programming,very short question?

Question

Here is the link for my program and sample run

It compiles will following warnings:

https://www.dropbox.com/sh/a7yrhhr45tdto55/rcrDOpj7xd

Bag.c: In function âempty_bagâ:
Bag.c:73: warning: incompatible implicit declaration of built-in function âmallocâ câ

However when I run it, it words perfectly fine,and I do't know what and why it complaining?

if there are other error or mistakes ,please let me know .

Thanks a lot

Answer 1

The malloc() function is undeclared so in C using an undeclared function is an "implicit declaration." The implicit declaration return type is int, and this does not match the built in definition that gcc uses.



To solve it include the stdlib.h header at the beginning of your program.

#include

Answer 2

This isn't an error, it's a warning that the malloc() function which is a built-in function has not been defined. The compiler thinks you are making a function overwriting the built-in function malloc() because you never included the library, since it never found a explicit decoration of it it assumes you are using the built-in function. That's why it will still work. To fix this add:



#include



To the top of your file with the rest of your libraries.

Answer 3

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