C++ Data Types

Datatype Modifiers

As the name implies, datatype modifiers are used with built-in data types to modify the length of data that a particular data type can hold. Data type modifiers in C++ are:

  • signed

  • unsigned

  • short

  • long

Const

const (constant) variables cannot be changed by your program during execution.

const double quarter = 0.25;
// and now variable quarter can only be 0.25

Simply add the keyword const before the data type during declaration to make the variable not modifiable.

Type Conversion

A type cast is basically a conversion from one type to another.

The notation (type) value means "convert value to type". So for example:

double weight1;
int weight2;

weight1 = 154.49;
weight2 = (int) weight1;

// weight2 is now 154
Going from a double to an int simply removes the decimal. There’s no rounding involved.