C++

to run code

g++ hello_world.cpp && ./a.out

add -std=c++11 to run vector code

g++ -std=c++11 code.cpp && ./a.out

Note

This syntax will work on mac system only.

Data Types

Primitive

• int - 4 Bytes
• char - 1 Bytes
• float - 4 Bytes
• double - 8 Bytes
• bool - 1 Bytes

Type Casting

Converting data from one type to another

• Conversion [implicit]

  • Small to big

    float (4 bytes) to double (8 bytes)

• Casting [explicit]

  • Big to Small

    double to int

    double price = 100.99;
    
    int newPrice = (int)price;
    cout << newPrice << endl;
    

    output:
    100