🔴 Advanced · Lesson 62

Modern C++ Features

What is Modern C++ Features?

Modern C++ Features
Modern C++ includes features such as auto, range-based for loop, nullptr, constexpr, move semantics and smart pointers. These make code safer and cleaner.

Level
🔴 STL, Modern C++ and Projects

Example File
modern-cpp.cpp

Main Focus
Concept + syntax + practical C++ program

Why should you learn this?

It helps you write correct and readable C++ programs.
It is used repeatedly in school practicals, projects and competitive programming.
It builds the base for advanced topics such as OOP, STL and data structures.

Important Terms

Term	Meaning / Use
auto	Modern C++ Features programming में Auto use होता है।
nullptr	Modern C++ Features programming में Nullptr use होता है।
range-for	Range-Modern C++ Features programming में for use होता है।
constexpr	Modern C++ Features programming में Constexpr use होता है।
move semantics	Modern C++ Features programming में Move semantics use होता है।

Syntax / Pattern

C++

Use auto for obvious types and range-for for container traversal.

Example Program

main.cpp

#include <iostream>
#include <vector>
using namespace std;
int main(){
    vector<int> nums = {10,20,30};
    for(auto x : nums) cout << x << " ";
}

Expected Output

10 20 30

Program Explanation

auto lets compiler infer type.
Range-based for loop simplifies traversal.

Exam Tip: In C++ practical answers, write the logic first, then the program, then expected output. For theory, always include one suitable example.

Where will you use it?

clean code
STL programs
modern projects

Common Mistakes

Overusing auto where type is unclear.
Using NULL instead of nullptr in modern code.

Practice Tasks

Rewrite loop using range-for.
Use nullptr in pointer example.

Summary

Modern C++ Features एक ज़रूरी C++ topic है। परिभाषा सीखें, syntax समझें, example program चलाएं और फिर practice tasks हल करके concept मज़बूत करें।