Ch 4 - Statement Forms

Question 1

Control statements fall into two basic classes

Answer 1

Conditionals and iteration

Question 2

Relational Operators

Answer 2

Are used to compare two values

Question 3

Can you use relational operators to compare Strings

Answer 3

No

Question 4

Logical Operators

Answer 4

! Logical Not && Logical And || Logical Or

Question 5

Short Circuit Evaluation

Answer 5

Style of evaluation which stops as soon as the answer is known

Question 6

Another name for Boolean variables?

Answer 6

Flags

Question 7

Test whether done has the value true

Answer 7

if(done)

Question 8

?: operator (Question-mark colon operator)

condition ? expression 1 : expression 2

Answer 8

Evaluates the condition. If the condition is true expression1 is evaluated. if the condition is falase the value is expression 2.

Question 9

Example of ?: operator

Answer 9

max = (x > y) ? x : y;

Question 10

Another example of ?: operator

Answer 10

(nItems == 1 ? “ “ : “s”)

Question 11

What is the form of the repeat-N-times pattern

Answer 11

for (int i = 0; i < N; i++{
statements etc.
}

Question 12

Initialization

Answer 12

setting a variable to its proper starting value

Question 13

Read-until-sentinel pattern

Answer 13

while (true) {
    PROMPT USER AND READ IN A VALUE
    if (value == sentintel) break;
    REST OF BODY
}

Question 14

Sentinel

Answer 14

a special value used to signal the end of the input list

Question 15

While statement

Answer 15

iterative construct which repeatedly execuates a simple statement or block until the conditional expression is false

Question 16

One way to solve the loop and a half program

Answer 16

Use the break statement

Question 17

Example of loop and a half

Answer 17

while (true){
if ( value == sentintel ) break;
Process the data value
}

Question 18

Operation of the for loop is determined by three expressions

Answer 18

init; test; step