C++ Codes - Basic to Advanced 💻

#cpp #iostream #basics #inputoutput #integers

Read two integers and print their sum

#include <iostream>

int main() {
  int a, b;
  std::cin >> a >> b;
  std::cout << a + b << std::endl;
  return 0;
}

#cpp #smartpointers #memorymanagement #uniqueptr

Print Hello World

#include <iostream>
#include <memory>

class MyClass {
public:
    MyClass(int value) : data(value) { std::cout << "MyClass created with value: " << data << std::endl; }
    ~MyClass() { std::cout << "MyClass destroyed with value: " << data << std::endl; }
    void printData() { std::cout << "Data: " << data << std::endl; }
private:
    int data;
};

int main() {
    std::unique_ptr<MyClass> ptr = std::make_unique<MyClass>(42);
    ptr->printData();

    if (ptr) {
        std::cout << "Pointer is not null" << std::endl;
    }

    std::unique_ptr<MyClass> ptr2 = std::move(ptr);

    if (!ptr) {
        std::cout << "Pointer is now null after move" << std::endl;
    }

    if (ptr2) {
        ptr2->printData();
    }

    return 0;
}

#cpp #ascii #character #inputoutput

Read a character and print its ASCII value

#include <iostream>

int main() {
 char ch;
 std::cin >> ch;
 int asciiValue = static_cast<int>(ch);
 std::cout << asciiValue << std::endl;
 return 0;
}

#cpp #programming #basics #interview #coding

Read two integers and print their sum

#include <iostream>

int main() {
 int a, b;
 std::cin >> a >> b;
 std::cout << a + b << std::endl;
 return 0;
}

#cpp #smartpointers #memorymanagement #unique_ptr

Print Hello World

#include <iostream>
#include <memory>

class Resource {
public:
    Resource(int value) : data(value) { std::cout << "Resource acquired: " << data << std::endl; }
    ~Resource() { std::cout << "Resource released: " << data << std::endl; }
    int data;
};

int main() {
    std::unique_ptr<Resource> ptr1(new Resource(10));
    std::unique_ptr<Resource> ptr2 = std::make_unique<Resource>(20);

    if (ptr1) {
        std::cout << "ptr1's resource value: " << ptr1->data << std::endl;
    }

    std::unique_ptr<Resource> ptr3 = std::move(ptr1);

    if (!ptr1) {
        std::cout << "ptr1 is now null." << std::endl;
    }

    if (ptr3) {
        std::cout << "ptr3's resource value: " << ptr3->data << std::endl;
    }

    return 0;
}

#cpp #datatypes #sizeof #memorymanagement

Find the size of different data types

#include <iostream>

int main() {
  std::cout << "Size of int: " << sizeof(int) << " bytes" << std::endl;
  std::cout << "Size of char: " << sizeof(char) << " byte" << std::endl;
  std::cout << "Size of float: " << sizeof(float) << " bytes" << std::endl;
  std::cout << "Size of double: " << sizeof(double) << " bytes" << std::endl;
  std::cout << "Size of bool: " << sizeof(bool) << " byte" << std::endl;
  std::cout << "Size of short: " << sizeof(short) << " bytes" << std::endl;
  std::cout << "Size of long: " << sizeof(long) << " bytes" << std::endl;
  std::cout << "Size of long long: " << sizeof(long long) << " bytes" << std::endl;
  std::cout << "Size of int*: " << sizeof(int*) << " bytes" << std::endl;
  return 0;
}

#cpp #swap #bitwise #interview

Swap two numbers without using a third variable

#include <iostream>

int main() {
  int a = 10;
  int b = 5;

  a = a + b;
  b = a - b;
  a = a - b;

  std::cout << "a = " << a << std::endl;
  std::cout << "b = " << b << std::endl;

  return 0;
}

#cpp #ascii #character #conversion

Read a character and print its ASCII value

#include <iostream>

int main() {
  char ch;
  std::cin >> ch;
  std::cout << static_cast<int>(ch) << std::endl;
  return 0;
}

Sum of Two Integers

#include <iostream>

int main() {
  int a, b;
  std::cin >> a >> b;
  std::cout << a + b << std::endl;
  return 0;
}

Smart Pointers (std::unique_ptr)

#include <iostream>
#include <memory>

class MyClass {
public:
    MyClass(int value) : data(value) { std::cout << "MyClass constructed with " << data << std::endl; }
    ~MyClass() { std::cout << "MyClass destructed with " << data << std::endl; }
    int getData() const { return data; }
private:
    int data;
};

int main() {
    std::unique_ptr<MyClass> ptr1 = std::make_unique<MyClass>(10);
    std::cout << "Value inside ptr1: " << ptr1->getData() << std::endl;

    std::unique_ptr<MyClass> ptr2 = std::move(ptr1);
    if (ptr1 == nullptr) {
        std::cout << "ptr1 is now null" << std::endl;
    }

    std::cout << "Value inside ptr2: " << ptr2->getData() << std::endl;

    return 0;
}

#cpp #basics #iostream #programming

Sum of Two Integers in C++

#include <iostream>

int main() {
    int a, b;
    std::cin >> a >> b;
    std::cout << a + b << std::endl;
    return 0;
}