ITP 120 Chapter 3
Which of the following is the not equal operator?
!=
What does the following code display? double x = 12.3798146; System.out.printf("%.2f\n", x);
12.38
Which of the following will format 12.78 to display as 12.8%?
System.out.printf("%.1f%%", 12.78);
All it takes for an OR expression to be true is for one of the subexpressions to be true.
TRUE
Java requires that the boolean expression being tested by an if statement be enclosed in
a set of parentheses
If you prematurely terminate an if statement with a semicolon, the compiler will
a. not display an error message b. assume you are placing a null statement there c. both (a) and (b)
What is the value of ans, x, and y after the following statements are executed? int ans = 0, x = 15, y = 25; if ( x >= y) { ans = x + 10; x -=y; } else { ans = y + 10; y += x; }
ans = 35, x = 15, y = 40
The switch statement is a
multiple alternative decision structure
Which of the following is the correct boolean expression to test for: int x being a value between, but not including, 500 and 650, or int y not equal to 1000?
((x > 500 && x < 650) || (y != 1000))
What would be the value of discountRate after the following statements are executed? double discountRate = 0.0; int purchase = 1250; if (purchase > 1000) discountRate = .05; if (purchase > 750) discountRate = .03; if (purchase > 500) discountRate = .01; else discountRate = 0;
.01
What will be the value of discountRate after the following statements are executed? double discountRate = 0.0; int purchase = 100; if (purchase > 1000) discountRate = 0.05; else if (purchase > 750) discountRate = 0.03; else if (purchase > 500) discountRate = 0.01;
0.0
What will be the value of discountRate after the following statements are executed? double discountRate; char custType = 'B'; switch (custType) { case 'A': discountRate = 0.08; break; case 'B': discountRate = 0.06; case 'C': discountRate = 0.04; default: discountRate = 0.0; }
0.0
What will be the value of discountRate after the following statements are executed? double discountRate = 0.0; int purchase = 1250; char cust = 'N'; if (purchase > 1000) if (cust == 'Y') discountRate = 0.05; else discountRate = 0.04; else if (purchase > 750) if (cust == 'Y') discountRate = 0.04; else discountRate = 0.03; else discountRate = 0.0;
0.04
What will be displayed after the following statements are executed? int ans = 10; int x = 65; int y = 55; if (x >= y) { int ans = x + y; } System.out.println(ans);
120
What is the value of charges after the following code has been executed? double charges, rate = 7.00; int time = 180; charges = time <= 119 ? rate * 2 : time / 60.0 * rate;
21.00
What would be the value of bonus after the following statements are executed? int bonus, sales = 1250; if (sales > 1000) bonus = 100; if (sales > 750) bonus = 50; if (sales > 500) bonus = 25; else bonus = 0;
25
Unicode is an international encoding system that is extensive enough to represent all the characters of all the world's alphabets.
TRUE
What will be the value of ans after the following statements are executed? int x = 40; int y = 40; if (x = y) ans = x + 10;
The code contains an error and will not compile.
What will be the values of ans, x, and y after the following statements are executed? int ans = 35, x = 50, y = 50; if (x >= y) { ans = x + 10; x -= y; } else { ans = y + 10; y += x; }
ans = 60, x = 0, y = 50
The __________ statement is used to create a decision structure which allows a program to have more than one path of execution.
if
In an if-else statement, if the boolean expression is false then
the statement or block following the else is executed
In Java, when a character is stored in memory, it is actually the __________ that is stored.
Unicode number
Which of the following is the correct boolean expression to test for: int x being a value less than or equal to 500 or greater than 650, or int y not equal to 1000?
((x <= 500 || x > 650) && !(y == 1000))
What will be the value of x after the following statements are executed? int x = 75; int y = 60; if (x > y) x = x - y;
15
What is the value of x after the following code has been executed? int x = 75; int y = 90; if (x != y) x += y;
165
What will be displayed after the following statements are executed? int y = 10; if (y == 10) { int x = 30; x += y; System.out.println(x); }
40
What will be printed when the following code is executed? double x = 45678.259; System.out.printf("%,.2f", x);
45,678.26
What is the value of ans after the following code has been executed?
80
What does the following code display? int d = 9, e = 12; System.out.printf("%d %d\n", d, e);
9 12
When testing for character values, the switch statement does not test for the case of the character.
FALSE
When two strings are compared using the String class's compareTo method, the comparison is not case sensitive.
FALSE
__________ operators are used to determine whether a specific relationship exists between two values.
Relational
Which of the following will format 12.7801 to display as $12.78?
System.out.printf("$%,.2f", 12.7801);
A local variable's scope always ends at the closing brace of the block of code in which it is declared.
TRUE
If the expression on the left side of the && operator is false, the expression on the right side will not be checked.
TRUE
In a switch statement, each of the case values must be unique.
TRUE
The String.format method works exactly like the System.out.printf method, except that it does not display the formatted string on the screen.
TRUE
The System.out.printf method formats a string and displays it in the console window.
TRUE
The if-else statement will execute one group of statements if its boolean expression is true or another group if its boolean expression is false.
TRUE
The boolean expression in an if statement must evaluate to
true or false
A __________ is a boolean variable that signals when some condition exists in the program.
flag
If str1 and str2 are both String objects, which of the following expressions will correctly determine whether or not they are equal?
str1.equals(str2)
Which of the following expressions could be used to perform a case-insensitive comparison of two String objects named str1 and str2?
str1.equalsIgnoreCase(str2)
________ works like this: If the expression on the left side of the && operator is false, the expression the right side will not be checked.
short-circuit evaluation
A flag may have the values
true or false
An expression tested by an if statement must evaluate to
true or false
What will be the value of bonus after the following statements are executed? int bonus, sales = 10000; if (sales < 5000) bonus = 200; else if (sales < 7500) bonus = 500; else if (sales < 10000) bonus = 750; else if (sales < 20000) bonus = 1000; else bonus = 1250;
1000
What would be the value of bonus after the following statements are executed? int bonus, sales = 85000; char dept = 'S'; if (sales > 100000) if (dept == 'R') bonus = 2000; else bonus = 1500; else if (sales > 75000) if (dept == 'R') bonus = 1250; else bonus = 1000; else bonus = 0;
1000
What will be the value of x after the following statements are executed? int x = 10; switch (x) { case 10: x += 15; case 12: x -= 5; break; default: x *= 3; }
20
What will be the value of pay after the following statements are executed? int hours = 45; double pay, payRate = 10.00; pay = hours <= 40 ? hours * payRate : 40 * payRate + (hours - 40) *payRate * 1.5;
475.00
All it takes for an AND expression to be true is for one of the subexpressions to be true.
FALSE
In a switch statement, if two different values for the CaseExpression would result in the same code being executed, you must have two copies of the code, one after each CaseExpression.
FALSE
Programs never need more than one path of execution.
FALSE
A block of code is enclosed in a set of
braces, { }
Which of the following expressions determines whether the char variable, chrA, is not equal to the letter 'A'?
chrA != 'A'
Which of the following statements determines whether the variable temp is within the range of 0 through 100 (inclusive)?
if (temp >= 0 && temp <= 100)
Which of the following expressions will determine whether x is less than or equal to y?
x <= y