If/Else

Analyze the following code:
boolean even = false;
if (even = true) {
 System.out.println("It is even!");
}

• The program has a compile error.
• The program has a runtime error.
• The program runs, but displays nothing.
• The program runs and displays It is even!.

Suppose income is 4001, what is the output of the following code:
if (income > 3000) {
 System.out.println("Income is greater than 3000");
}
else if (income > 4000) {
 System.out.println("Income is greater than 4000");
}

• no output
  No output
• Income is greater than 3000 
• Income is greater than 3000 followed by Income is greater than 4000
• Income is greater than 4000 followed by Income is greater than 3000

Suppose you write the code to display "Cannot get a driver's license" if age is less than 16 and 
"Can get a driver's license" if age is greater than or equal to 16. 
Which of the following code is the best?

• if (age < 16) 
   System.out.println("Cannot get a driver's license");
  if (age >= 16) 
   System.out.println("Can get a driver's license");
• if (age < 16) 
   System.out.println("Cannot get a driver's license");
  else 
   System.out.println("Can get a driver's license");
• if (age < 16) 
   System.out.println("Cannot get a driver's license");
  else if (age >= 16) 
   System.out.println("Can get a driver's license");
• if (age < 16) 
   System.out.println("Cannot get a driver's license");
  else if (age > 16) 
   System.out.println("Can get a driver's license");
  else if (age == 16) 
   System.out.println("Can get a driver's license");

The following code displays ___________.
double temperature = 50;
if (temperature >= 100)
 System.out.println("too hot");
else if (temperature <= 40)
 System.out.println("too cold");
else
 System.out.println("just right");

• too hot
• too cold
• just right
• too hot too cold just right

Assume x = 4 and y = 5, Which of the following is true?

• x < 5 && y < 5
•  x < 5 || y < 5
•  x > 5 && y > 5
• x > 5 || y > 5

 What is the output of the following code?
char ch = 'F';
if (ch >= 'A' && ch <= 'Z')
 System.out.println(ch);

• F
• f
• nothing
• F f

Analyze the following program fragment:
int x;
double d = 1.5;
switch (d) {
 case 1.0: x = 1;
 case 1.5: x = 2;
 case 2.0: x = 3;
}

• The program has a compile error because the required break statement is missing in the switch statement.
• The program has a compile error because the required default case is missing in the switch statement.
• The switch control variable cannot be double.
• No errors.

 What will be displayed by the following switch statement?
 char ch = 'a';
 
 switch (ch) {
 case 'a':
 case 'A':
 System.out.print(ch); break;
 case 'b':
 case 'B':
 System.out.print(ch); break;
 case 'c':
 case 'C':
 System.out.print(ch); break;
 case 'd':
 case 'D':
 System.out.print(ch);
 }

• abcd
• a
• aa
• abc

The order of the precedence (from high to low) of the operators binary +, *, &&, || is:

• &&, ||, *, +
• *, +, &&, ||
• *, +, ||, &&
  
•  ||, &&, *, +

What is the value of the following expression?
true || true && false

order of operation is && first and then ||

• true
• false