C++ array size dependent on function parameter causes compile errors

Question

I have a simple function in which an array is declared with size depending on the parameter which is int.

    void f(int n){
        char a[n];
    };

    i         


        

Answer 1

Your method of allocating from the stack is a g++ extension. To do the equivalent under MSVC, you need to use _alloca:

char *a = (char *)_alloca(n);