Question

How to get int array size in C

Answer 1

#include <stdio.h>

int main()
{
    int arr[5];

    printf("%d\n", *(&arr + 1) - arr);

    printf("%d\n", sizeof(arr)/sizeof(arr[0]));

    return 0;
}


          
/*
run:
       
5
5

*/

 

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Answer 2

#include <stdio.h>

int main()
{
    int arr[] = {4, 9, 0, 1};

    printf("%d\n", *(&arr + 1) - arr);

    printf("%d\n", sizeof(arr)/sizeof(arr[0]));

    return 0;
}


          
/*
run:
       
4
4

*/

 

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