COSC-1337 Chapter 4

Question 1

What is a semi-colon used for in C++?

Answer 1

A semi-colon is used ONLY after you have written a complete statement.

Question 2

What happens if you accidentally put a semi-colon after the “if (condition)”?

Answer 2

The semi-colon will become a “null terminator” and the statements in the block following the “if statement” will execute regardless of wether or not the conditions are met.

A “null terminator” is considered a blank statement in C++ that does nothing. This would result in terminating the “if statement” early.

Question 3

When a message is printed to let the user know that they have entered in invalid input, what is this called?

Answer 3

Input validation

Question 4

What is “is alpha()” used for?

Answer 4

To test whether or not a variable or input is a alphabetic character

Question 5

Variables that are defined inside the set of braces are known to have a?

Answer 5

Local scope or Block scope

Question 6

What does a conditional operator look like?

Answer 6

x >= 0 ? y = 1 : z = 25;

Question 7

What type of operator is a conditional operator known as?

Answer 7

Ternary operator. This is because it has three operands.

Question 8

Does a switch structure recognize both upper case and lower case letters?

Answer 8

Yes.

Question 9

How do we create a data type named “Names” and assign the values of 22, 55, and 205 to the variables Tim, Jim, Pam?

Answer 9

enum Names {Tim = 22, Jim = 55, Pam = 205};

Question 10

What file header do you need to use with things like isalpha();?

Answer 10

cctype header file