Please provide the function or module header in in c++ code for each of the following. Include comments that describe the parameters and return values (if a value is returned). Do not define the function, just give the header or prototype and comments. Be sure to indicate if the parameters need to be passed by reference. 1. Swaps two reals. 2. Calculates and returns the sales tax of 8.25 given the price and the amount of the tax rate (both as reals). 3. Returns the concatenation of two strings. 4. Performs a search of a string for a character and returns true if the character is found and false otherwise.

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Types of Function

A function is a process or task that does some operation in the program. Some programming languages may contain built-in functions for certain commonly used tasks. Most programming languages also support user-defined functions, which means a user can write their own function to perform some operation. There are some libraries or header files that contain built-in functions for performing certain tasks.