Thread: Global Variables

Well, what do you think?

Lets look at a very simple example:

Code:

int a;
int b;
int add() {
  return a+b;
}
int main(void) {
  a = 1;
  b = 2;
  printf("a+b=%d\n",add());
  return 0;
}

Now, I have initialised two global variables here which both functions (main and add) can use. But what if I took them away and initialised them in main() ?

Code:

int add(int a, int b) {
  return a+b;
}
int main(void) {
  int a, b;
  a = 1;
  b = 2;
  printf("a+b=%d\n",add(a,b));
  return 0;
}

Here I initialise the variables in main() and pass them to the add function - add(int a, int b). I didn't need to do this before as they were declared globally. Do you understand?