APUNTS_C++.md

Apunts C++ - LeetCode Problemes

Introduction

Print

cout << "Hello World!";

Scanner

cin >> x;

Types

bool a = true; string b = "AAA";

Constants

const float PI = 3.14;

Math

cout << max(5, 10);
cout << min(5, 10);
cout << sqrt(64);
cout << round(2.6);
cout << log(2);

Initialize arrays

int myNum[3] = {10, 20, 30};

Get the Size of an Array

sizeof(myNumbers)

How many elements an array has

sizeof(myNumbers) / sizeof(int)

Struct

struct {
  int myNum;
  string myString;
} myStructure;

Default parameter on a function call

void myFunction(string country = "Norway") {
  cout << country << "\n";
}

myFunction();
myFunction("USA");

Classes

Primer exemple senzill:

class MyClass {      
  public:             
    int myNum;        
    string myString;
    void myMethod2();
    
    void myMethod() {
      cout << "Hello World!";
    }
};

void MyClass::myMethod2() {
  cout << "Hello World!";
}

Exemple amb constructor:

class Car {
  public:
    int year;     
    Car(int z) {
      year = z;
    }
};

int main() {
  Car carObj1(1999);
  return 0;
}

Exemple amb constructor:

class Car {
  public:
    int year;     
    Car(int z);
};

Car::Car(int z) {
  year = z;
}

int main() {
  Car carObj1(1999);
  return 0;
}