C++ Tutorial | KNOWe Platform

KNOWe Learning Module

Learn C++

Master C++ programming fundamentals, logic building, and object-oriented concepts for systems programming.

Start Learning Jump to Mini Project

Why Learn C++?

Strong Fundamentals

Excellent for learning programming logic, memory management, and control flow.

Technical Value

Widely used in game development, systems programming, and competitive coding.

C++ Syntax

A C++ program starts with iostream and a main function. Try it yourself!

Try C++ Code

Output

Variables in C++

Variables store data with explicit types. Try them!

Data Types

Common C++ data types: int, double, char, bool, string.

If...Else Conditions

Conditions help make decisions. Try different marks!

Loops in C++

Loops repeat a block of code. Try for and while loops!

Functions in C++

Functions organize reusable logic. Try creating functions!

OOP Basics: Classes and Objects

C++ supports classes and objects for object-oriented programming.

#include <iostream>
#include <string>
using namespace std;

class Student {
private:
    string name;
    int age;
    double marks;
    
public:
    // Constructor
    Student(string n, int a, double m) {
        name = n;
        age = a;
        marks = m;
    }
    
    // Methods
    void displayInfo() {
        cout << "Student: " << name << endl;
        cout << "Age: " << age << endl;
        cout << "Marks: " << marks << "%" << endl;
    }
    
    string getGrade() {
        if (marks >= 90) return "A+";
        else if (marks >= 80) return "A";
        else if (marks >= 70) return "B";
        else if (marks >= 60) return "C";
        else if (marks >= 40) return "D";
        else return "F";
    }
    
    bool isPassed() {
        return marks >= 40;
    }
};

int main() {
    Student student1("Riya Sharma", 20, 92);
    Student student2("Aman Patel", 22, 65);
    Student student3("Priya Singh", 19, 38);
    
    cout << "=== Student Records ===" << endl;
    student1.displayInfo();
    cout << "Grade: " << student1.getGrade() << endl;
    cout << "Status: " << (student1.isPassed() ? "PASSED" : "FAILED") << endl;
    cout << endl;
    
    student2.displayInfo();
    cout << "Grade: " << student2.getGrade() << endl;
    cout << "Status: " << (student2.isPassed() ? "PASSED" : "FAILED") << endl;
    cout << endl;
    
    student3.displayInfo();
    cout << "Grade: " << student3.getGrade() << endl;
    cout << "Status: " << (student3.isPassed() ? "PASSED" : "FAILED") << endl;
    
    return 0;
}

🎯 Mini Project: Number Analysis System

#include <iostream>
#include <vector>
using namespace std;

class NumberAnalyzer {
private:
    vector<int> numbers;
    
public:
    void addNumber(int num) {
        numbers.push_back(num);
    }
    
    int getSum() {
        int sum = 0;
        for (int num : numbers) {
            sum += num;
        }
        return sum;
    }
    
    double getAverage() {
        if (numbers.empty()) return 0;
        return (double)getSum() / numbers.size();
    }
    
    int getMax() {
        if (numbers.empty()) return 0;
        int maxVal = numbers[0];
        for (int num : numbers) {
            if (num > maxVal) maxVal = num;
        }
        return maxVal;
    }
    
    int getMin() {
        if (numbers.empty()) return 0;
        int minVal = numbers[0];
        for (int num : numbers) {
            if (num < minVal) minVal = num;
        }
        return minVal;
    }
    
    int countEven() {
        int count = 0;
        for (int num : numbers) {
            if (num % 2 == 0) count++;
        }
        return count;
    }
    
    int countOdd() {
        int count = 0;
        for (int num : numbers) {
            if (num % 2 != 0) count++;
        }
        return count;
    }
    
    void displayAll() {
        cout << "Numbers: ";
        for (int num : numbers) {
            cout << num << " ";
        }
        cout << endl;
    }
};

int main() {
    NumberAnalyzer analyzer;
    
    // Add sample numbers
    int sampleNumbers[] = {23, 45, 12, 67, 34, 89, 56, 78, 91, 43};
    
    cout << "=== C++ Number Analysis System ===" << endl;
    cout << "Adding numbers: ";
    for (int num : sampleNumbers) {
        analyzer.addNumber(num);
        cout << num << " ";
    }
    cout << endl << endl;
    
    analyzer.displayAll();
    cout << "Sum: " << analyzer.getSum() << endl;
    cout << "Average: " << analyzer.getAverage() << endl;
    cout << "Maximum: " << analyzer.getMax() << endl;
    cout << "Minimum: " << analyzer.getMin() << endl;
    cout << "Even numbers count: " << analyzer.countEven() << endl;
    cout << "Odd numbers count: " << analyzer.countOdd() << endl;
    
    // Additional analysis
    cout << "\n=== Prime Numbers ===" << endl;
    cout << "Prime numbers in the list: ";
    // Simple prime check for demo
    int primeCount = 0;
    for (int i = 0; i < 10; i++) {
        bool isPrime = true;
        if (sampleNumbers[i] <= 1) isPrime = false;
        for (int j = 2; j * j <= sampleNumbers[i]; j++) {
            if (sampleNumbers[i] % j == 0) {
                isPrime = false;
                break;
            }
        }
        if (isPrime) {
            cout << sampleNumbers[i] << " ";
            primeCount++;
        }
    }
    if (primeCount == 0) cout << "None";
    cout << endl;
    
    cout << "\n✅ Number analysis complete!" << endl;
    
    return 0;
}

C++ Assessment

Test your understanding of C++ fundamentals.

1. C++ is a compiled language.
Yes No

2. Which symbol is used for output in common C++ examples?
cout echo print

3. C++ can be used for programming fundamentals.
True False

Complete the quiz and click submit.

Learner Progress

Track completion of this C++ module.

Course Progress0%

Intro & Why C++

Syntax & Variables

Data Types & Conditions

Loops & Functions

OOP Basics

Mini Project & Assessment

Next Steps

✓ Practice loops and conditions with number problems
✓ Write simple input/output programs using cin and cout
✓ Try small logic exercises like odd-even, prime numbers, and factorial
✓ Continue to arrays, pointers, dynamic memory allocation
✓ Explore advanced OOP: inheritance, polymorphism, and templates
✓ Build console-based applications like calculators and inventory systems