A type cast is basically a conversion from one type to another. There are two types of type conversion:
- Implicit Type Conversion
Also known as ‘automatic type conversion’.
- Done by the compiler on its own, without any external trigger from the user.
- Generally takes place when in an expression more than one data type is present. In such condition type conversion (type promotion) takes place to avoid lose of data.
- All the data types of the variables are upgraded to the data type of the variable with largest data type.
bool -> char -> short int -> int -> unsigned int -> long -> unsigned -> long long -> float -> double -> long double
- It is possible for implicit conversions to lose information, signs can be lost (when signed is implicitly converted to unsigned), and overflow can occur (when long long is implicitly converted to float).
Example of Type Implicit Conversion:
// An example of implicit conversion
x = 10;
// integer x
// character c
// y implicitly converted to int. ASCII
// value of 'a' is 97
x = x + y;
// x is implicitly converted to float
z = x + 1.0;
"x = %d, z = %f"
, x, z);
x = 107, z = 108.000000
- Explicit Type Conversion–
This process is also called type casting and it is user defined. Here the user can type cast the result to make it of a particular data type.
The syntax in C:
Type indicated the data type to which the final result is converted.
// C program to demonstrate explicit type casting
x = 1.2;
// Explicit conversion from double to int
sum = (
)x + 1;
"sum = %d"
sum = 2
Advantages of Type Conversion
- This is done to take advantage of certain features of type hierarchies or type representations.
- It helps us to compute expressions containing variables of different data types.
This article is contributed by Ankita Dutta. If you like GeeksforGeeks and would like to contribute, you can also write an article and mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above
- Implicit Type Conversion in C with Examples
- Catch block and type conversion in C++
- Conversion of Struct data type to Hex String and vice versa
- Advanced C++ | Conversion Operators
- Array Type Manipulation in C++
- What is the size_t data type in C?
- Implicit return type int in C
- What is data type of FILE in C ?
- Is there any need of "long" data type in C and C++?
- Data Type Ranges and their macros in C++
- Type Inference in C++ (auto and decltype)
- Data type of character constants in C and C++
- const_cast in C++ | Type Casting operators
- C | Storage Classes and Type Qualifiers | Question 19
- C | Storage Classes and Type Qualifiers | Question 1