Erle Robotics C++ GitBook

Global Variables

They are vaiables that can be accessed from any function. For example, how many times is function foo() called?

#include <iostream>

int numCalls = 0;

void foo() {

int main() {
 foo(); foo(); foo();
 std::cout << numCalls << endl; // 3

 return 0;

numCalls is a global variable. Where a variable was declared, determines where it can be accessed from.