C++ Basics

#include <iostream>
#include <cmath>
using namespace std;
const double PI = 3.141592653589793;

int main() {
    double radius;
    double volume;

    cout << "Volume Sphere Calculator" << endl;
    cout << "Enter radius: ";
    cin >> radius;

    if (radius < 0) {
        cout << "Error: Radius cannot be negative." << endl;
        return 1; 
    }

    volume = (4 * PI * pow(radius, 3)) / 3;
    cout << "The Volume Sphere is: " << volume << endl;
    return 0;
}

👍8🥰3

625 views✞Faith✞, edited 05:33

C++ Basics

Quiz Scenario: Create two variables that accept name and age, then display them to the user. you should use appropriate data types

#include <iostream>

using namespace std;

int main() {
    string name;
    int age;

    cout << "Please enter your name: " << endl;
    cin>>name;

    cout << "Please enter your age: " << endl;
    cin >> age;


    cout << "Name: " << name << endl;
    cout << "Age: " << age << endl;

    return 0;
}

👍9

504 views✞Faith✞, edited 19:35

C++ Basics

Quiz
What's the output of this code and if you got error fix it and explain why it occur?

#include <iostream>
using namespace std;


void add();

int main() {
    int age = 21;
    add();
    return 0;
}

void add() {
    cout << "Age: " << age << endl;
}

526 views✞Faith✞, edited 18:54

C++ Basics

Forwarded from Dagi

#include <iostream>
using namespace std;

int age = 21;

void add() {
cout << "Age: " << age << endl;
}

int main() {
add();
return 0;
}
Like this

👏4🤔2👍1

530 views✞Faith✞, 19:08

C++ Basics

This one also possible

#include <iostream>
using namespace std;
int age = 21;

void add();

int main() {
     add();
    return 0;
}

void add() {
    cout << "Age: " << age << endl;
}

Output :21

549 views✞Faith✞, edited 19:09

C++ Basics

Ehen ensera ena lezare yebekanal
Write the output of this👇 code?

#include <iostream>
using namespace std;

int main( ) {
int n = 4, k = 2;
cout<< ++n << endl;

cout<< n++ << endl;
cout<< n << endl;
cout<< --n << endl;
cout<< n << endl;
cout<< n--<< endl;

cout<< n + k << endl;
cout<< k << endl;
cout<< " n" << endl;
cout<< "\n" << endl;
cout<< " n * n = ";
cout<< n * n << endl;
cout<< 'n' << endl;
return 0;
}

👍8👏1

602 views✞Faith✞, edited 19:41

C++ Basics

#include <iostream>
using namespace std;

int main() {
    int numb1, numb2;

    cout << "Please Enter Number 1:" << endl;
    cin >> numb1;
    cout << "Please Enter Number 2:" << endl;
    cin >> numb2;
    cout << "X + Y :" << numb1 + numb2 << endl;

    if (numb2 != 0) {
        cout << "X / Y :" << numb1 / numb2 << endl;
    }
    cout << "X * Y :" << numb1 * numb2 << endl;
    cout << "X - Y :" << numb1 - numb2 << endl;

    if (numb1 > numb2) {
        cout << "Number " << numb1 << " is Greater than Number " << numb2 << endl;
    } else if (numb1 < numb2) {
        cout << "Number " << numb1 << " is Greater than Number " << numb2 << endl; 
    } else {
        cout << "They are equal" << endl;
    }
    return 0;
}

🥰5👍4

693 views✞Faith✞, 20:24

C++ Basics

Photo

#include <iostream>

using namespace std;

const double PI = 3.14159265358979323846;  

int main() {
    double radius;
    double circumference;

    cout << "Please enter the radius: " << endl;
    cin >> radius;

    if (radius <= 0) {
        cout << "Radius must be a positive number." << endl;
        return 1;
    }

    circumference = 2 * PI * radius;

    cout << "The circumference of the circle is: " << circumference << endl;
    return 0;
}

👍2🔥2

686 views✞Faith✞, 20:35

C++ Basics

3..

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

int main() {
    double root1, root2;
    int a, b, c;
    double discriminant, square;

    cout << "Please Enter coefficient A:" << endl;
    cin >> a;
    cout << "Please Enter coefficient B:" << endl;
    cin >> b;
    cout << "Please Enter coefficient C:" << endl;
    cin >> c;

    cout << a << "x^2+" << b << "x+" << c << endl;

    if (a == 0) {
        cout << "Division by zero isn't possible" << endl;
        return 1;
    }

    discriminant= pow(b, 2) - (4 * a * c);
    
     if(discriminant>0){
     square =sqrt(discriminant);
    root1 = (-b + square) / (2 * a);
    root2 = (-b - square) / (2 * a);
    cout << "Root1 :"<<root1 << endl;
    cout << "Root2 :"<<root2<< endl;
    }else if(discriminant==0){
    square =sqrt(discriminant);
    root1=(-b)/(2*a);
    cout << "Root: " << root1<< endl;
    }else{
    cout << "The equation is complex number"<< endl;
    }

    
    return 0;
}

👍3🔥2

806 views✞Faith✞, edited 22:05

C++ Basics

Input a string and count the vowels(a,e,I,o,u) . Algorithm,pseudocode and flowchart.please do me this .

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

int main()
{
    string name;
    cout << "Enter A text " << endl;
    getline(cin,name);
    int count=0;
    for(int i=0; i<name.length(); i++) {
        switch(name[i])
        {
        case 97: 
        case 65: 
            count++;
            break;

        case 101: 
        case 69: 
            count++;
            break;
        case 105: 
        case 73: 
            count++;
            break;
        case 111: 
        case  79: 
            count++;
            break;
        case 117: 
        case 85: 
            count++;
            break;
        }
    }
    if(count==0) {
        cout << "There is no vowels" << endl;
    }
    else {
        cout << "There are "<<count<<" vowels" << endl;
    }
    return 0;
}

👍5

652 views✞Faith✞, 17:20

C++ Basics

Function

✅What is a Function?
A function is a reusable block of code that performs a specific task.

Think of a vending machine:
- Input (Parameters): You select a snack (e.g., B3 for chips).
- Process (Function Body): The machine processes your request.
- Output (Return Value): It delivers the chips.

✅Function Components
a) Declaration (Menu)

// Like the vending machine's menu  
int getDrink(int selection);

- Tells the compiler a function exists.

b) Definition (Machine Internals)

// Like the machine's internal mechanism  
int getDrink(int selection) {  
    if (selection == 1) return COKE;  
    else return WATER;  
}

c) Call (Pressing the Button)**

int myDrink = getDrink(1);  // Output: COKE

✅Types of Functions
-Library Function
sqrt(25) (from <cmath>)

-User-Defined
calculateTax(income)

✅Parameter Passing
a) Call by Value (Photocopy)

void printReceipt(int amount) {  
    // Works with a COPY of the original  
    cout << "Amount: " << amount;  
}

- Like giving a photocopy of your ID – changes don’t affect the original.

b) Call by Reference (Original Document)

void updateBalance(int &account) {  
    account -= 100;  // Modifies the ORIGINAL  
}

- Like signing the original contract – changes are permanent.

Example:

int wallet = 500;  
updateBalance(wallet);  // wallet becomes 400

✅Why Use Functions?
Reusability: Like a recipe you reuse (e.g., calculateInterest()).

Modularity: Break problems into smaller parts (e.g., login(), checkout()).

Debugging: Fix one function without breaking others.

✅Exam-Style Example :

// Function to check even numbers  
bool isEven(int num) {  
    return (num % 2 == 0);  
}

✅Common Mistakes
1.Missing Return Statement:

   int sum(int a, int b) {  
       a + b;  // Error! No return.  
   }

2.Incorrect Parameters:

   void greet(string name) { ... }  
   greet();  // Error! Missing argument.

✅ Real-World Coding Example
Scenario: A coffee shop calculator.

#include <iostream>  
using namespace std;  

// Function to calculate total cost  
float calculateTotal(int coffees, float price) {  
    return coffees * price;  
}  

int main() {  
    int cups = 3;  
    float cost = calculateTotal(cups, 2.5);  
    cout << "Total: $" << cost;  // Output: $7.5  
    return 0;  
}

Key Insight:
- calculateTotal is like a cashier – you give inputs (cups, price), it returns the result.

❤3🔥3😁1

373 views✞Faith✞, 20:33

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