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C++ Introduction & From C to Modern C++
Namespaces, std::cout, references, and auto type deduction
Created in 1979 by Bjarne Stroustrup as "C with Classes", Modern C++ (C++11 through C++23) is a multi-paradigm language offering zero-cost abstractions, deterministic destructors, and extreme performance.
Modern C++ Foundations
std::cout & Streams: Stream insertion operator << replaces unsafe printf format strings with type-safe stream output.
Namespaces: namespace my_ns { ... } avoids global naming collisions. Access members using the scope resolution operator ::.
auto: The compiler automatically deduces variable types at compile-time with zero runtime performance cost.
#include <iostream>
#include <string>
int main() {
// auto automatically deduces std::string
auto message = "Welcome to Modern C++!";
int xp = 150;
std::cout << message << " | Learner XP: " << xp << std::endl;
return 0;
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Test Yourself With Exercise
What is the purpose of the `auto` keyword in Modern C++ (C++11 and later)?