.:: Bots United ::. - sizeof of argument array might be suprising...

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sizeof of argument array might be suprising...

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

Re: sizeof of argument array might be suprising...

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)

Re: sizeof of argument array might be suprising...

yep. ... I should reload before posting