What are inline functions? What is the syntax for defining an inline function?

The C++ language provides inline functions to reduce the function call overhead. An inline function is a method or function that is expanded in line when it is called. Whenever the inline function is called, the complete code of the inline function gets inserted or substituted at the point of the inline function call. The C++ compiler does this substitution at compile time. The inline function may increase the efficiency of the code if it is small.

The syntax for defining the function inline is:

inline return-type function-name(parameters)

{
// function code
}