How to declare global variable inside function?

Question

I have problem creating global variable inside function, this is simple example:

int main{
   int global_variable;  //how to make that
}

This is exactly what I want to do:

int global_variable;
int main{
                   // but I wish to initialize global variable in main function
}

Answer 1

You have two problems:

1. main is not a loop. It's a function.

2. Your function syntax is wrong. You need to have parentheses after the function name. Either of these are valid syntaxes for main :

    int main() { } int main(int argv, const char* argv[]) { }

Then, you can declare a local variable inside main like so:

int main() {
  int local_variable = 0;
}

or assign to a global variable like so:

int global_variable;

int main() {
  global_variable = 0;
}

Answer 2

There is no way to declare it the way you want. And that's it.

But:

• First, if you want you can declare it before the main body but assign a value to it inside main . Look Paul's answer for that
• Second, actually there is no advantage of declaring variables the way you want. They are global and that means they should be declared in the global scope and no other places.

Answer 3

int global_variable;
int main()
{
               global_variable=3; // look you assigned your value.
}

Answer 4

嗯……通过声明全局指针，然后将局部变量分配给它们，间接可能是可行的，但有时可能会导致无法访问指向变量的情况。