1-A function must be defined or declared above the locations in the source code file from where it is called. We declare a function by writing a function declaration (which is a statement so it ends with a semicolon). Another term for function declaration is ?
2-Write a function declaration for a function named ValidateEyeColor which returns nothing and has one parameter, an int, named choice.
3-Suppose a constant double variable named LB_PER_KG has been defined and initialized to 2.20462262. Let lbs be a double variable that represents a person's weight in pounds. Write an arithmetic expression that would convert the weight in pounds to weight in kilograms, using LB_PER_KG.
4-What C++ Standard Library header file must be included to use the abs() function?