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sizeof of argument array might be suprising...
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ghost of evilspy
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Default sizeof of argument array might be suprising... - 17-07-2007

Just something I wasn't aware of...

Code:
#include <stdio.h>

int test_array1[] = { 1,2,3,4,5,6, };

int func_test_array3(int test_array3[6])
{
	return(sizeof(test_array3));
}

int func_test_array5(int len)
{
	int test_array5[len];
	
	return(sizeof(test_array5));
}

int main(void)
{
	int test_array2[6];
	int test_array4[] = {1,2,3,4,5,6,};
	
	printf("sizeof(test_array1): %d\n", sizeof(test_array1));
	printf("sizeof(test_array2): %d\n", sizeof(test_array2));
	printf("sizeof(test_array3): %d\n", func_test_array3(test_array2));
	printf("sizeof(test_array4): %d\n", sizeof(test_array4));
	printf("sizeof(test_array5): %d\n", func_test_array5(6));
	
	return(0);
}
Code above outputs:
sizeof(test_array1): 24
sizeof(test_array2): 24
sizeof(test_array3): 4
sizeof(test_array4): 24
sizeof(test_array5): 24
   
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Re: sizeof of argument array might be suprising...
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Whistler
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Default Re: sizeof of argument array might be suprising... - 18-07-2007

the arrays in parameters are the same as pointers, so that's why you got result like that.

i.e.,

int func_test_array3(int test_array3[6])

is 100% the same as:

int func_test_array3(int *test_array3)
   
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Re: sizeof of argument array might be suprising...
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@$3.1415rin
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Default Re: sizeof of argument array might be suprising... - 18-07-2007

yep. ... I should reload before posting


   
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