C++ Data Types Quiz

Data Types in C++

• Data types specify the size and type of values to be stored.
• Data types are used to tell variables the type of data they can store.
• The compiler allocates memory for variables based on their data type.

Primary/Built-in/Fundamental Data Types

• Integer (int): Used for whole numbers.

  • Requires 4 bytes of memory.
  • Range: -2,147,483,648 to 2,147,483,647

• Floating Point (float): Used for single-precision decimal values.

  • Requires 4 bytes of memory.
  • Example: float area = 64.74;

• Double Floating Point (double): Used for double-precision decimal values (more precise than float).

  • Requires 8 bytes of memory.
  • Example: double volume = 134.64534;

• Character (char): Used for storing single characters.

  • Requires 1 byte of memory.
  • Range: -128 to 127 or 0 to 255.
  • Example: char test = 'h';

• Boolean (bool): Used for storing logical values (true or false).

  • Example: bool cond = false;

• Void (void): Represents a valueless entity.

  • Used for functions that don't return a value.
  • You can't declare variables of type void.

• Wide Character (wchar_t): Used for storing characters that require more than 8 bits.

  • Typically 2 or 4 bytes long.
  • Example: wchar_t i = L'b';

C++ Data Types

• Data types in C++ specify the size and type of values stored in variables.
• They tell the compiler how much memory to allocate for variables.
• Different data types require different amounts of memory.

Primary or Built-in Data Types

• Integer (int): Used for whole numbers. Requires 4 bytes of memory and ranges from -2,147,483,648 to 2,147,483,647. Example: int salary = 85000;
• Floating Point (float): Used for single-precision decimal values. Requires 4 bytes of memory. Example: float area = 64.74;
• Double Floating Point (double): Used for double-precision decimal values (higher precision than float). Requires 8 bytes of memory. Example: double volume = 134.64534;
• Character (char): Used for storing single characters. Requires 1 byte of memory and can represent ASCII characters (range: -128 to 127 or 0 to 255). Example: char test = 'h';
• Boolean (bool): Used for storing logical values (true or false). Example: bool cond = false;
• Void (void): Represents a valueless entity. Used for functions that do not return a value. Note: You cannot declare variables of type void.
• Wide Character (wchar_t): Used for storing characters that require more than 8 bits of memory. Typically 2 or 4 bytes long. Example: wchar_t i = L'b';