How can I initialize an array globally in C or C++?

Question

I'm trying to do this:

for(int k=0; k<context.size(); k++)
{
   cc_no_issue[k]=0;
}

Can someone tell me how I can do that globally? Whenever I try I get these errors:

expected unqualified-id before "for"
k does not define a type
k does not define a type

Answer 1

This will do:

long cc_no_issue[100]={0};

And this is the proper initialization.

Note: this will initialize all the contents to 0.

This sentence:

long cc_no_issue[100]={1,2};

will set cc_no_issue[0] to 1, cc_no_issue[1] to 2, and the rest to 0. You could see the link above for more information.

Answer 2

If you have a global array of a basic type,

int some_array[1000];

It will automatically be initialized to zero. You do not have to initialize it. If you do need to run initialization code, you can do a hack like the following (in C++):

struct my_array_initializer {
    my_array_initializer() {
        // Initialize the global array here
    }
};
my_array_initializer dummy_variable;

If you are on GCC (or Clang), you can execute code before main with the constructor attribute:

__attribute__((constructor))
void initialize_array()
{
    // Initialize the global array here
}