Question

Hello I was reading this question, I got confused with how if we can pass arrays by value or not. Here is a piece of code which I think should pass array by value.

#include <cstdio>
void foo (int arr[]);
int main()
{
    int arr[10];
    foo(arr[10]);
    return 0;
}
void foo (int arr[])
{
.......
}

Please tell me why wouldn’t it pass by value?

Thanks

Answer 1

Arrays automatically decay into pointers in certain contexts in C. Function calls are one of those places. That said, you are passing the pointer by value – C has no other way to pass parameters than “by value”.