What is the type of the expression (age >= 18)?
Which expression tests that x lies strictly between 0 and 10?
What is the value of true && false || true?
Which statement about && is correct?
Why is the order of operands important in
if (count != 0 && total / count > 50)?
!(a || b) is equivalent to:
The negation of grade >= 60 && grade <= 100 is:
What is printed?
int x = -3;
if (x > 0);
System.out.println("positive");
What is printed?
int score = 45;
if (score > 50)
System.out.println("Pass");
System.out.println("Done");
What is printed?
int n = 7;
if (n > 5)
if (n > 10) System.out.println("big");
else System.out.println("medium");
In the previous question, to which if does the else belong?
What is the value of grade after this ladder when mark is 85?
char grade;
if (mark >= 70) grade = 'C';
else if (mark >= 80) grade = 'B';
else if (mark >= 90) grade = 'A';
else grade = 'F';
What is wrong with the ladder in the previous question?
Which condition is true when ch holds an upper-case letter?
How should two String variables be compared for equal contents?
What is the output when the user's input has been stored in answer as "YES"?
if (answer.equalsIgnoreCase("yes")) System.out.print("Confirmed");
else System.out.print("Cancelled");
Which of the following may not be used as the selector of a switch?
What happens if a case block does not end with break?
What is the output?
int day = 3;
switch (day) {
case 1: System.out.print("Mon");
case 2: System.out.print("Tue");
case 3: System.out.print("Wed");
case 4: System.out.print("Thu");
default: System.out.print("?");
}
What is the output?
char c = 'b';
switch (c) {
case 'a':
case 'b': System.out.print("ab"); break;
case 'c': System.out.print("c"); break;
default: System.out.print("other");
}
Is the default label required in a switch?
Which statement is the best reason to prefer an if ladder over a switch?
What is the output?
int a = 5, b = 10;
System.out.print(a > b ? "first" : a == b ? "equal" : "second");
What is printed?
boolean flag = false;
if (flag = true) System.out.print("yes");
else System.out.print("no");
Why does if (x = 5) fail to compile when x is an int?
What is printed?
int x = 8;
if (x % 2 == 0 && x % 4 == 0) System.out.print("A");
else if (x % 2 == 0) System.out.print("B");
else System.out.print("C");
How many of the following conditions are true when x is 0?
x >= 0, x <= 0, x != 0, !(x > 0)
What is the output?
int n = 15;
String result = "";
if (n % 3 == 0) result += "Fizz";
if (n % 5 == 0) result += "Buzz";
System.out.print(result.isEmpty() ? n : result);
Which condition correctly checks that a year is a leap year (divisible by 4 but not by 100, unless also divisible by 400)?
Which expression is true exactly when ch is not a digit?
What is the output?
String s = null;
if (s != null && s.length() > 3) System.out.print("long");
else System.out.print("short or none");
What would happen if the two operands of && in the previous question were swapped?
Which of these is not a valid Java condition?
What is the output?
int marks = 60;
char grade = (marks >= 50) ? ((marks >= 75) ? 'A' : 'B') : 'F';
System.out.print(grade);
Rewrite the following as a single assignment statement, with no
if and no else: “if the mark is at least 50 set passed to true, otherwise set it to false”.
Explain, with an example of your own, what short-circuit evaluation is and give one situation in which a program would crash without it.
Rewrite the following switch as an if/else if ladder,
and say which version you find clearer and why.
switch (code) {
case 'S': cost = 5; break;
case 'M': cost = 8; break;
case 'L': cost = 12; break;
default: cost = 0;
}
Write a program TriangleType that reads three side lengths and
prints Not a triangle, Equilateral, Isosceles or Scalene. Remember that the
sum of any two sides must exceed the third.