Scope of variable within an if statement

if_scope.cpp

#include <iostream>

int main()
{
    int cond = 1;

    if (int var = cond)
    {
        std::cout << "if: var=" << var << "\n";
    }
    else if (int var = cond)
    {
        std::cout << "if else: var=" << var << "\n";
    }
    else if (int var = cond)
    {
        std::cout << "if else: var=" << var << "\n";
        // int var = 1; //error: redefine variable
    }
    else if (var = cond)
    {
        std::cout << "if else: var=" << var << "\n";
        int var = 2; // warning: hide variable
    }
    else
    {
        std::cout << "else: var=" << var << "\n";
    }

    //auto x = int z = 1; //error: does not build

    for (int i = 1; i <= 4; i++)
    {
        if (int j = i % 2)
        {
            std::cout << "for: i=" << j << "\n";
        }
        else
        {
            std::cout << "for: i=" << j << "\n";
        }
    }

    return 0;
}