Test 2 CSCI 130 Fall 2015

Please answer each question fully, carefully and thoughtfully.
No credit will be given for unreadable answers, please write neatly.
Answer the questions in any order, but please number each answer.
Make sure that your name is on your test.
When ask to give code segments, you need not write an entire program.

Integers
1. [3 points] Name three different integer types. What is the relationship between these types?
2. [1 point] Under normal circumstances which integer type should be used?
3. [2 points] What does the unsigned reserved word do when used with an integer type? Why would this be used?
4. [1 point] What does the modulus operator do?
5. [2 points] Describe integer division. Give a code example where integer division produces unexpected results.
6. [3 points] Describe the operation of the postfix increment operator. Give a small code example using the postfix increment operator and explain what your example does.
Input/Output
1. [2 points] Describe how the stream extraction operator works with a floating point variable as the destination.
2. [2 points] Give an example of input for which using the stream extraction operator with a floating point variable as the destination will fail. Explain why this input will cause a failure.
3. [2 points] What happens when a stream failure occurs?
Floating Point
- [2 points] Discuss the types of values that are represented as floating point numbers. Give examples.
Coercion and Type Casting
1. [2 points] Define coercion and type casting.
2. [3 points] Why should a program perform type casting over coercion?
3. [3 points] Give a small code segment, including variable declarations, which illustrates how to perform type casting.
I/O Manipulators
1. [2 points] Describe the syntax of the setw operator.
2. [2 points] Describe the semantics of the setw operator.
3. [2 points] Give a short example using the setw operator, expalin what your example does.
4. [1 point] Why would a programmer use the setw operator?
Flow of control
1. [2 points] What is the flow of control in a program?
2. [2 points] What is a control structure?
Boolean Datatype
1. [4 points] Describe the boolean datatype.
2. [2 points] Discuss the difference between the = operator (1 = sign) and the == operator (2 = signs).
[5 points] Program: Write a complete program which reads in the temperature in Fahrenheit and prints the result in Celsius. C = 5/9(F-32)