🟡 Control Flow · Lesson 21

Arrays in C++

What is Arrays in C++?

Arrays in C++
An array stores multiple values of the same data type in continuous memory locations and accesses them using index numbers.

Level
🟡 Control Flow and Core Programming

Example File
arrays.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
array	Array used in Arrays in C++ programming.
index	Index used in Arrays in C++ programming.
size	Size used in Arrays in C++ programming.
element	Element used in Arrays in C++ programming.
traversal	Traversal used in Arrays in C++ programming.

Syntax / Pattern

data_type arr[size];

Example Program

#include <iostream>
using namespace std;
int main(){
    int marks[5] = {80, 75, 90, 88, 67};
    int total = 0;
    for(int i=0; i<5; i++) total += marks[i];
    cout << "Total = " << total;
    return 0;
}

Expected Output

Total = 400

Program Explanation

Array indexing starts from 0.
Loop visits every element and adds it to total.

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?

marks lists
student scores
fixed-size collections

Common Mistakes

Accessing arr[size] as last element.
Using uninitialized arrays.

Practice Tasks

Find largest element in an array.
Calculate average marks using array.

Summary

Arrays 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.