🔴 Advanced · Lesson 63

Sorting and Searching in C++

What is Sorting and Searching in C++?

Sorting and Searching in C++
Sorting arranges data in a specific order and searching finds a required value. C++ provides STL algorithms for both.

Level
🔴 STL, Modern C++ and Projects

Example File
sorting-searching.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
sort	Sort used in Sorting and Searching in C++ programming.
linear search	Linear search used in Sorting and Searching in C++ programming.
binary search	Binary search used in Sorting and Searching in C++ programming.
algorithm	Algorithm used in Sorting and Searching in C++ programming.
complexity	Complexity used in Sorting and Searching in C++ programming.

Syntax / Pattern

sort(v.begin(), v.end()); binary_search(v.begin(), v.end(), value);

Example Program

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
    vector<int> v = {30,10,20};
    sort(v.begin(), v.end());
    cout << binary_search(v.begin(), v.end(), 20);
}

Expected Output

Program Explanation

Data is sorted before binary_search.
binary_search returns true/false.

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?

rank lists
marks sorting
fast lookup

Common Mistakes

Using binary_search on unsorted data.
Confusing index with value.

Practice Tasks

Sort marks descending.
Implement linear search manually.

Summary

Sorting and Searching in C++ is an important C++ topic. Learn the definition, understand the syntax, run the example program and then solve the practice tasks to make the concept strong.