CS 150 Introduction to Computer Science

Why do computers use zeros and ones?

_______ are instructions to the computer.

________ is the physical aspect of the computer that can be seen.

Computer can execute the code in ________.

________ is an operating system.

Java ________ can run from a Web browser.

________ is interpreted.

The main method header is written as:

Which of the following statements is correct to display Welcome to Java on the console?

The JDK command to compile a class in the file Test.java is

Java compiler translates Java source code into ________.

The extension name of a Java bytecode file is

________ is a software that interprets Java bytecode.

The extension name of a Java source code file is

Every statement in Java ends with ________.

A block is enclosed inside ________.

________ are secondary storage.

The keywords in Java are all in lowercase.

You use ________ to run a Java program.

Which of the following is a valid identifier?

Which of the following are correct ways to declare variables? A)int length, width; B)int length; int width; C)int length, int width; D)int length; width;

________ is the Java assignment operator.

Which of the following assignment statements is incorrect.

A)i=j=k=1;

B)i=1=j=1=k=1;

C)i==j==k==1;

D)i=1; j=1; k=1;

To declare a constant MAX_LENGTH inside a method with value 99.98, you write

Which of these data type requires the most amount of memory?

A)byte B)short C)long D)int

To declare an int variable number with initial value 2, you write:

A)int number=2l;

B)int number=2L;

C)int number=2;

D)int number=2.0;

Which of the following expressions will yield 0.5?

A)(double) (1 / 2)

B)1 / 2

C)1.0 / 2

D)1 / 2.0

E)(double) 1 / 2

Which of the following expression results in a value 1?

A)2 % 1

B)15 % 4

C)25 % 5

D)37 % 6

Analyze the following code.public class Test {public static void main(String[ ] args) {int month=09;System.out.println("month is "+month);}}

A)The program displays month is 09

B)The program displays month is 9.0

C)The program displays month is 9

D)The program has a syntax error, because 09 is an incorrect literal value.

Which of the following assignment statements is illegal?

A)float f=-34;

B)int t=23;

C)short s=10;

D)int t=4.5;

E)int t=(int)false;

What is the value of (double)5/2?

A)3;

B)3.0;

C)2.5;

D)2;
E)2.0;

A Java character is stored in ________.

33)33)Which of the following statement prints smith\exam1\test.txt?

A)System.out.println("smith\exam1\test.txt");

B)System.out.println("smith"\exam1"\test.txt");

C)System.out.println("smith\"exam1\"test.txt");

D)System.out.println("smith\\exam1\\test.txt");

The ________ method parses a string s to an int value.

A)integer.parseInteger(s);

B)integer.parseInt(s);

C)Integer.parseInt(s);

D)Integer.parseInteger(s);

The ________ method parses a string s to a double value.

The expression (int)(76.0252175 * 100) / 100 evaluates to ________.

A)76.02

B)76.0252175

C)76.03

D)76

If a program compiles fine, but it produces incorrect result, then the program suffers ________.

You can always assign a value of long type to a variable of int type without loss of precision.

You can always assign a value of int type to a variable of long type without loss of information.

A variable may be assigned a value only once in the program.

You can change the value of a constant.

To add a to b and store result in b, you write:

To declare a constant PI, you write

A Java statement ends with a ________.

Which of the following operators has the highest precedence?

A)/

B)+

C)*

D)casting

An int variable can hold ________.
A)'x'

B)93

C)True

D)98.3

E)A and B

If you attempt to add an int, a byte, a long, and a double, the result will be a ________ value.

What is the printout of the following code:double x=10.1;int y=(int)x;System.out.println("x is "+x+" and y is "+y);

A)x is 10.0 and y is 10.0

B)x is 10.1 and y is 10

C)x is 10.1 and y is 10.0

D)x is 10 and y is 10

E)x is 11 and y is 11

In Java, the word true is ________.

Suppose x=10 and y=10 what is x after evaluating the expression (y > 10) & (x++>10).

A)9

B)11

C)10

Suppose x=10 and y=10 what is x after evaluating the expression (y > 10) && (x++>10).

Which of the following code displays the area of a circle if the radius is positive.

A)if (radius>=0)

System.out.println(radius * radius * Math.PI);

B)if (radius<=0) System.out.println(radius * radius * Math.PI);

C)if (radius !=0) System.out.println(radius * radius * Math.PI);

D)if (radius>0) System.out.println(radius * radius * Math.PI)

53)What is y after the following switch statement is executed? x=3;switch (x+3) {case 6: y=0;case 7: y=1;default: y+=1;}

A)3

B)2

C)4

D)1

What is the printout of the following switch statement?char ch='b';switch (ch) {case 'a':System.out.print(ch);case 'b':System.out.print(ch);case 'c':System.out.print(ch);case 'd':System.out.print(ch);}

A)b

B)bcd

C)abcd

D)bbb

E)bb

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;}

A)The switch control variable cannot be double.

B)The program has a syntax error because the required break statement is missing in the switch statement.

C)The program has a syntax error because the required default case is missing in the switch statement.

D)No errors

You can always convert a switch statement to an equivalent if statement.

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

A)&, ||, &&, *,+

B)*,+, &, ||, &&

C)*,+, &&, ||, &

D)&&, ||, &, *,+

E)*,+, &, &&, ||

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