C++ Part 25

Functions

• Breaks code down into manageable chunks to write (and divide across development team)
• Easier to debug – only one idea behind each module
• Easier to maintain – buggy modules may be replaced without worrying about ramifications on other modules
• Outsiders only need to know a module’s interface, not the details of its implementation.
• Avoids duplication of code ⇒ more compact, and also easier to modify if code has bug  

• Predefined functions: e.g., String.length(): String → Int  
• Programmer-Defined functions: used similarly to predefined functions  
  
  This predefined functions need using namespace std;
  

Source : Absolute C++

C++ Part 17

Boolean Expressions

A Boolean expression is any expression that is either true or false.


AND Example

(2 < x) && (x < 7)

 

And Example with IF AND ELSE

if ( (score > 0) && (score < 10)) cout << "score is between 0 and 10.\n"; else cout << "score is not between 0 and 10.\n";

 

OR Example

(y < 0)||(y < 12)

Precede Order:

If one operation is performed before another, the operation that is performed first
is said to have higher precedence.

Intro to C++ Part 4

• Declaration of variables: How does the variable map onto memory? Updating variable: How do we update the variable, and what do we update it with? 
• I/O: How do we input and output data into the system? 
• Control: How do we control which statement gets executed next? 
• Modularity and Object Orientation: How do we organize the program to enable proper software engineering practices? 
• Comments: Used to describe code; ignored by compiler, but code unmaintainable without good comments! C/C++: on line beginning with // or surrounded by /*, */