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Intro to Programming

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Unit 3 Assignment 1: Homework
Learning Objectives and Outcomes
 Describe the use of variables (declaration: specifies properties of an identifier, it declares what a word means, and is most commonly used for functions, variables, constants and classes. It can also be used for other things like enumerations and type definitions. Naming: The variable name is the way to reference the stored value. It allows the name to be used independently of the exact information it represents. Assignment: It sets or re-sets the value stored in the storage locations marked by a variable name. It copies a value into the variable. Assignments allow a variable to hold different values at different times during its life span and scope. Although, some languages do not allow that kind of “destructive” reassignment because it could imply changes of non-local state. and Initialization: The process of locating and using the defined values for variable data that is used by a computer program. The operating system or application is installed with default or user-specified values that determine certain aspects of how the system or program is to function. These values are stored in initialization files. When the operating system or an application program is first loaded into memory, a part of the program performs initialization, finds definite values to substitute for variable values, and acts accordingly in program designs.
 Use the correct data type for variables in program designs. Variables are “placeholders” used to store values that have names and data types. The data type of a variable determines how the bits representing those values are stored in the computer’s memory. When you declare a variable, you can also supply a data type for it. All variable have a data type that determines what kind of data they can store. Performance indicators measure the effectiveness of management actions implemented to meet policy objectives. They lead to three categories of representation.
• Simple trends in absolute values such as of catch
• Qualitative and quantitative changes in infrastructure/institutional arrangements which affect management outcomes, such as changes in access right systems or degree or participation
• Trends in relative values (not between the absolute value and its related reference points.
 Describe the usefulness of properly commenting code: Commenting involves placing Human Readable Descriptions inside of computer programs detailing what the code is doing. Proper use of commenting can make code maintenance much easier, as well as helping make finding bugs faster. Commenting is important when writing functions that other people will use. All programs should be commented in such a manner as to easily describe the purpose of code and any algorithms used to accomplish the purpose. A user should be able to utilize a previously written program without having to look at the code, but by simply reading the comments.

Assignment Requirements
Answer:
 Short Answer 5 and 6 on page 71
5. What two things must you normally specify in a variable declaration? You must specify the variable type and identifier
6. What value is stored in uninitialized variables? Languages assign a default value such as 0 to uninitialized variables. Although many languages with uninitialized variables will hold unpredictable values.

 Algorithm Workbench Review Questions 3-10, starting on page 71: Write assignment statements that perform operations with variables a, b and c.
 A: adds 2 to a and stores the result in b
 B: Multiplies b times four and stores the result in set a. (a=bx4)
 C: Divides a by 3.14 and stores the result in b (b=3.14/b)
 D: Subtracts 8 from b and stores the result in a (a=b-8)
4. Assume the variables result, w,x, y, and z are all integers, and that w= 5, x= 4, y=8 and z=2. What will the values be stored in result in each of the following statements? a. set result= x+y= 4+8
b. set result=z*2= 2*2 c. set result= y/x= 8/4 set result= y-z= 8-2
5. Write a pseudocode statement that declares the variable cost so it can hold real numbers. Floating-point variable cost 6.
Display the original price – Input the original price and display the price
Write a pseudocode statement that declares the variable cost so it can hold real numbers: Floating point variable cost 6:

 Programming Exercise Questions 6 and 8 on page 73

Required Resources
 Textbook

Submission Requirements
Submit your written answers to your instructor at the beginning of Unit 4.

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