Using Global Variables

Unit 4 Research Paper Assignment 1: Using Global Variables
1. Five advantages of using global variables
• It is accessible to all modules in a program
• You only have to declare it once outside the modules
• It is good to use it for constants you want to keep consistent
• It simplifies maintenance, avoids duplication of local constants
• It can make a program easier to read in reference to constants
Five disadvantages of using global variables
• It makes debugging difficult
• Any statement in a program can change the variable
• If modules use global variables it is dependent upon the module and if other modules are presented you have to redesign all over each time
• It makes a program hard to understand since it can be modified and have to be aware of all other parts of the program that access it
• Global variables are not willing direct into flowcharts
2. How can you declare global and local variables in flowcharts?
• Global variables are displayed in pseudo code but not in flowcharts directly o In order to declare global variables in a flowchart, you’d put that variable in the main part of the program (the main box where other functions will branch off from) for local variables, you’d put those variables in the box where each separate functions executed.
3. How can you declare global and local variables in pseudocode
• A local variable is a variable declared inside a construct, such as a class or function, whole a global variable is a variable declared outside of any construct.