memory allocated within function and passed out of it

[lehe]

Hi,
I am asking for using "malloc" to allocate memory within a self-written function and then pass on to the outside of the function. I did it this way but guess that it might be the reason that caused run-time memory error. Could you please point out if it is wrong and give the correct way? Thanks in advance!

void main(){
int* ptr;
myfun(&ptr);
free(ptr);
}


void myfun(int**p){
int num;
// read the value of "num" from some file...
*p=(int*)malloc(num*sizeof(int));
}

 

[cpjust]

There are 2 things wrong with your code that I can see:

1. There's no such thing as void main(). main() returns an int. See:

http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1044841143&id=1043284376

2. You shouldn't cast malloc(). See:

http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1047673478&id=1043284351

Are you having any problems with the code now, or are you just wondering if it's correct?

 

[lehe]

Thanks for pointing out what I was not unware of.

Besides that, let's move back to my original question. Will it cause runtime memory error using "malloc" to allocate memory within a function and then pass on to its outside?

 

[ArkM]

Don't worry. You may use a pointer to allocated memory here, there and everywhere.