2.6 Type Conversions

Automatically, by Definition of Operators

• Mixed mode expressions.
  • Integral promotion: char, short, and enumeration into int.
  • Upward promotion along the list: int, unsigned int, long, unsigned long, float, double, long double.
• Assignment instructions: into type of receiver.

By Casting

• Prefix notation ‘( type ) value’
  x ∗ (double) 15;
• Function-call notation ‘type (value)’
  x ∗ double(15);

Note: Casting might not be safe, e.g., wide to narrow data type

The following table shows the integer representation of characters.