Implicit and Explicit type of Conversion

Define Implicit and Explicit type of Conversion

Implicit Type Conversions
- A narrowing conversion is one that converts an object to a type that cannot include all of the values of the original type e.g., float to int

- A widening conversion is one in which an object is converted to a type that can include at least approximations to all of the values of the original type

e.g., int to float

- A mixed-mode expression is one that has operands of different types
- Coercion is an implicit type conversion

- Disadvantage of coercions:

-They decrease in the type error detection ability of the compiler
- In most languages, all numeric types are coerced in expressions, using widening conversions

Explicit Type Conversions

- Called casting in C-based language

- Examples

 C: (int) angle
 Ada: Float (sum)

- Note that Ada’s syntax is similar to function calls