C++ array assign error: invalid array assignment

Question

I\'m not a C++ programmer, so I need some help with arrays. I need to assign an array of chars to some structure, e.g.

struct myStructure {
  char message[40         


        

Answer 1

You need to use memcpy to copy arrays.

Answer 2

The declaration char hello[4096]; assigns stack space for 4096 chars, indexed from 0 to 4095. Hence, hello[4096] is invalid.

Answer 3

Why it doesn't work, if mStr.message and hello have the same data type?

Because the standard says so. Arrays cannot be assigned, only initialized.

Answer 4

Because you can't assign to arrays -- they're not modifiable l-values. Use strcpy:

#include <string>

struct myStructure
{
    char message[4096];
};

int main()
{
    std::string myStr = "hello"; // I need to create {'h', 'e', 'l', 'l', 'o'}
    myStructure mStr;
    strcpy(mStr.message, myStr.c_str());
    return 0;
}

And you're also writing off the end of your array, as Kedar already pointed out.