Finding length of array inside a function [duplicate]

Answer 1

As others have said the obvious solution is to pass the length of array as parameter, also you can store this value at the begin of array

#include <stdio.h>

void temp(int *ar)
{
    printf("%d\n", ar[-1]);
}

int main(void)
{
    int ar[]= {0, 1, 2, 3};
    ar[0] = sizeof(ar) / sizeof(ar[0]) - 1;
    printf("%d\n", ar[0]);
    temp(ar + 1);
    return 0;
}