1. Programmer-Defined Functions, Call-by-Value, Multiple Files Lab 5
Lab Instructor: Salem Othman

2. Review Go to Dr. Mikhail Nesterenko website and read the topics:
Programmer-defined functions, local and global variables, call-by-value
Separate files, independent compilation, header files
Void-functions, predicates, call-by-reference
You need to understand:
Programmer-Defined Functions
function name, function head, function body, return type, return statement
Function Invocation (caller, callee)
Function arguments
Function Prototype
Local Variables
Global Constants and Variables
Call-by-Value
Program in Multiple Files
Include Files
Multiple Inclusion Protection

3. Function argument double circleArea (double r) {
function name
parameter
return type
argument
double circleArea (double r) {
const double PI = ;
return PI * r * r; }
function head
cout << circleArea(4)+6 << endl;
invocation
function body
return statement

4. 2 5 1 2 5 1 8 2 5 1 2 5 1 8 var1 var2 var3 result arg1 arg2 arg32 5 1 2 5 1 8
arg1
arg2
arg3
result 2 5 1 2 5 1 8

5. sum.cpp

6. Sum.h
sum.cpp
sumFun.cpp

7. Multiple Inclusion Protection
header file myheader.h containing definitions usually has the following structure:
#ifndef MYHEADER_H
#define MYHEADER_H
// text of the header file goes here
#endif

8. Character