CMSC131 Review UMD with all Correct & 100% Verified Answers |Actual Complete Exam| Already Graded A+

CMSC131 Review UMD with all Correct & 100% Verified
Answers |Actual Complete Exam| Already Graded A+

Why are there 8 different numeric types in java? ✔Correct Answer--Because java is a restrictive
language: it requires that the bit count is noted and known. Different types have different bit counts,
so it shows the size.

How would you write an int and float constants? ✔Correct Answer--int i= number;
float f= number;

How would declare a variable with initialization versus without? ✔Correct Answer--with:
int i= 2;

without:
int i;

What is the order of precedence? ✔Correct Answer--1. parentheses/brackets
2. cast/new objects
3. multiplication/division
4. addition/subtraction
5. relational (instanceof)
6. equality
7. and (&&)
8. or (||)
9. assignment

How would you print "Hello World" onto one line? ✔Correct Answer--System.out.print("Hello ");
System.out.print("World");

How would you print "Hello World" onto 2 separate lines? ✔Correct Answer--
System.out.println("Hello");
System.out.println("World");

What is the difference between system.out.println(); and system.out.print(); ✔Correct Answer--
println prints the messages on different lines while print prints the messages on the same line

How can you convert an int to a char? ✔Correct Answer--Declaration
1. set the char to a variable
2. set an int variable to that char variable

NumericValue
1. create an int variable that is the Character.getNumericValue(charVariable);

String Value of
1. Create an int variable
2. assign it to Integer.parseint(String.valueOf(c));

How do you cast a float to an int? ✔Correct Answer--Math.round
1. use Math.round();

, Type Casting
1. int value= (int) 3.10f//

How do convert an int to a char? ✔Correct Answer--Type Casting
int a=65;
char c=(char)a;

Character.forDigit()
int a=1;
char c= Character.forDigit(a);

What is a widening type conversion? ✔Correct Answer--When you are casting a type object to a
greater primitive data type:

-byte to short, int, long, float, or double

-short to int, long, float, or double

-char to int, long, float, or double

-int to long, float, or double

-long to float or double

-float to double

What is a narrowing type conversion? ✔Correct Answer--When you are going from a larger
primitive data type to a smaller, meaning you must cast the type/round it.

How would you declare a char variable equal to a? ✔Correct Answer--char ch= 'a'; //needs single
quotes

How would you generate a random number? ✔Correct Answer--Math.random(); //returns double
between 0.0 and 1.0

Random class:
Random rand= new Random ();
int r= rand.nextInt(100); //number 1 to 99

What is the ASCII value for 'a' through 'z'? ✔Correct Answer--97-122

What is the ASCII value for 'A' through 'Z'? ✔Correct Answer--65-90

What is the ASCII value for '0' to '9'? ✔Correct Answer--48-57

How would you convert a string to an integer? ✔Correct Answer--Integer.parseInt(string);

How would you convert a specified int to a string? ✔Correct Answer--static String s.toString(int);

How would you return the value of a character object? ✔Correct Answer--Character.charValue();