🟡 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	Arrays in C++ programming में Array use होता है।
index	Arrays in C++ programming में Index use होता है।
size	Arrays in C++ programming में Size use होता है।
element	Arrays in C++ programming में Element use होता है।
traversal	Arrays in C++ programming में Traversal use होता है।

Syntax / Pattern

C++

data_type arr[size];

Example Program

main.cpp

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

Arrays in C++ क्या है?

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

मुख्य फोकस
Concept + syntax + practical C++ program

इसे क्यों सीखें?

यह आपको सही और पढ़ने-योग्य C++ programs लिखने में मदद करता है।
यह school practicals, projects और competitive programming में बार-बार use होता है।
यह OOP, STL और data structures जैसे advanced topics की नींव बनाता है।

ज़रूरी Terms

Term	अर्थ / उपयोग
array	Array Arrays in C++ programming में use होता है।
index	Index Arrays in C++ programming में use होता है।
size	Size Arrays in C++ programming में use होता है।
element	Element Arrays in C++ programming में use होता है।
traversal	Traversal Arrays in C++ programming में use होता है।

Syntax / Pattern

C++

data_type arr[size];

Example Program

main.cpp

#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

आम गलतियाँ (Common Mistakes)

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

अभ्यास (Practice Tasks)

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

सारांश

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