Ch 4 - Gaddis

Question 1

Relational operators

Answer 1

Relational operators allow you to compare numeric and char values and determine whether one is greater than, less than, equal to, or not equal to another.

Question 2

if statement

Answer 2

The if statement can cause other statements to execute only under certain conditions.

Question 3

Expanding the if statement

Answer 3

The if statement can conditionally execute a block of statements enclosed in braces.

Question 4

The if/else statement

Answer 4

The if/else statement will execute one group of statements if the expression is true, or another group of statements if the expression is false.

Question 5

Nested if statements

Answer 5

To test more than one condition, an if statement can be nested inside another if statement.

Question 6

The if/else if statement

Answer 6

the if/else if statement tests a series of conditions. It is often simpler to test a series of conditions with the if/else statement than with a set of nested if/else statements.

Question 7

Flags

Answer 7

A flag is a boolean or integer variable that signals when a condition exists.

Question 8

Logical operators

Answer 8

Logical operators connect two or more relational expressions into one, or reverse the logic of an expression.

Question 9

Checking numeric ranges

Answer 9

Logical operators are effective for determining whether a number is in or out of a range.

Question 10

Menus

Answer 10

You can use nested if/else statements or the if/else if statement to create menu-driven programs. A menu-driven program allows the user to determine the course of action by selecting it from a list of actions.

Question 11

Validating user input

Answer 11

As long as the user of a program enters bad input, the program will produce bad output. Programs should be written to filter out bad input.

Question 12

Comparing characters and strings

Answer 12

Relational operators can also be used to compare characters and string objects.

Question 13

Conditional operator

Answer 13

You can use the conditional operator to create short expressions that work like if/else statements.

Question 14

Switch statement

Answer 14

The switch statement lets the value of a variable or expression determine where the program will branch.

Question 15

Blocks and variable scope

Answer 15

The scope of a variable is limited to the block in which it is defined.