scope code block : block scope variable « Language Basics « C++ Tutorial

1. C++ Tutorial
2. Language Basics
3. block scope variable

#include <iostream>

using namespace std;

void func();

int main()
{
    int var = 5;
    cout << "In main() var is: " << var << "\n\n";

    func();

    cout << "Back in main() var is: " << var << "\n\n";
    {
        cout << "In main() in a new scope var is: " << var << "\n\n";
        cout << "Creating new var in new scope.\n";
        int var = 10;
        cout << "In main() in a new scope var is: " << var << "\n\n";
    }

    cout << "At end of main() var is: " << var << "\n";

    return 0;
}

void func()
{
    int var = -5;  // local variable in func()
    cout << "In func() var is: " << var << "\n\n";
}