Thread: size of dynamic array

Hi, i have the following program:

Code:

#include <stdio.h>
#include <stdlib.h>

int main(){

	int *test, i;
	int test2[5] = {1,2,3,4,5};

	test = malloc(5*sizeof(int));

        //populate dynamic array with arbitary data
	for(i=0; i<5; i++){
		
		test[i] = i+1;
		printf("test[%d] = %d\n", i, test[i]);
		
	}

//OUTPUT 1
	printf("sizeof test  = %d\n", sizeof(test));

//OUTPUT 2
       printf("sizeof test2 = %d\n", sizeof(test2));

}

The OUTPUT 1 returns the size of test (the dynamically allocated array) to be 4 and OUTPUT 2 returns test2 as 20. Surely they should both be the same (ie 20) as they both hold 5 elements each. Or is there a different way for establiching the size of a dynamic array?

thanks i advance.

tg

Originally Posted by Dave_Sinkula

You know the size when you ask for it -- keep track of it if you want it elsewhere.

Kool - thought it mite be sumtin like that. thanks for clearing it up for me.

tg