Introduction to Computer Science

In the statement below, the value stored in variable temp is called ___________?

double temp = Math.pow(3, 4);

• argument

• return value

• input

• method call

What value is returned by the method call Math.pow (1 + 2, 3) ?

• 3.0

• 6.0

• 9.0

• 27.0

Consider the following code segment:

String str1 = "ONE";

String str2 = "TWO";

System.out.print(str2 + str1);

What will be printed when this code segment is executed?

• str1str2

• str2str1

• ONETWO

• TWOONE

• TWO ONE

Which of the following Java statements displays the message "Hello World" on the console window?

• print("Hello World");

• System.out.print("Hello" + "World");

• System.print("Hello World");

• System.out.print("Hello" + " " + "World");

• System.out("Hello World");

Which of the following is a valid variable declaration? Assume that length is a variable of type int and milesPerGallon a variable of type double.

• int volume = length * length * length;

• in gallonsConsumed = milesDriven / milesPerGallon;

• double greeting = "HelloHello";

• String greeting = 2 * "Hello";

Which of the following represents a correct way to declare and initialize a variable named counter?

• counter = 1;

• int counter = 1;

• int counter = "one";

• int counter = 1.0;

Assuming that variable dollars and cost have been declared, which of the following assignment statements is INVALID?

• cost = dollars + 100;

• cost = cost + 50;

• dollars + 100 = cost;

• dollars = cost;

Assuming that in is a properly initialized object of the Scanner class, which of the following code segments is most appropriate for reading an integer value to be entered by the user?

• System.out.print("Please enter the number of tests");

  int tests = in.nextInt();

• System.out.println("Please enter the number of tests: ");

  int tests = in.nextInt();

• System.out.print("Please enter the number of tests: ");

  int tests = in.nextInt();

• System.out.print("Please enter the number of tests: ");

  double tests = in.nextInt();