Argument coercion is a feature of function prototypes by which the compiler implicitly converts the datatype of the arguments passed during the function call to match the datatype in the definition of the function.
It follows Argument promotion rules. Therefore a lower datatype maybe converted into a higher datatype but vice-versa is not true. This is because when a higher datatype is converted to a lower datatype it can result into loss or truncation of data.
The Promotion hierarchy for fundamental datatypes in C++ is:
Example: Take for Example the code given below consists of an add function that expects double arguments. But even when integer arguments are passed it works correctly. In case long double arguments are passed the code will give an error.
Don’t stop now and take your learning to the next level. Learn all the important concepts of Data Structures and Algorithms with the help of the most trusted course: DSA Self Paced. Become industry ready at a student-friendly price.
- Variable Length Argument in C
- Difference between Argument and Parameter in C/C++ with Examples
- C function argument and return values
- Why copy constructor argument should be const in C++?
- Difference between C and Objective C
- Strict Aliasing Rule in C with Examples
- Difference between cout and puts() in C++ with Examples
- Difference between forward list and list in C++
- Short-Circuiting in C++ and Linux
- Different types of range-based for loop iterators in C++
- Learn C++ Programming Step by Step - A 20 Day Curriculum!
- Difference between C and Dart
- Difference between Sentinel and Counter Controlled Loop in C
- Why do we need reference variables if we have pointers
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.