Casting, Incrementing, and Tracing values

Casting

100

Convert to double:

int num = 10;

double data = num;

//To covert into double you'd have to assign to new variable

200

When converting from int to double, are you widening the range or narrowing the range?

You are widening the range.

Remeber that double has a bigger range (biggest overall) than integer.

300

Convert to int:

double num = 10.99;

int data = (int)num;

Will have to assing to a new variable.

400

When converting from double to int, are you widening the range or narrowing the range?

You are narrowing the range; interger is smaller than double

500

Can you convert an integer data type into a String data type?

Yes.

Java can convert Int to String Using the ToString Method

Incrementing

100

What is the value of newNum and of i when:

int i = 10;

int newNum = 10 * i;

 i= i + 1;

    

i= 11

newNum= 100

200

What is the value of a,b, and c:

int a=11, b=22, c;

c = a + b + a+  b +a +b;

a=11

b=22

c=99

300

int m = 0,  n = 1;

m++;

n+=2;

System.out.println(m);

System.out.println(n);

m= 1

n= 3

400

What is the value of p?

int m = 0, n = 1;

int p = m++ * n++;

System.out.println(p);

      

The value of p is 0

Because p take the original values of m and n:

so the problem is actually 0*1

500

int a = 6; int b = a++;

System.out.println(a);

System.out.println(b);

a = 6; b = ++a;

System.out.println(a); System.out.println(b);

a=7

b=6

a=7

b=7

Trace the Value

100

What is the value of item when:

item= item+5;

the value of item would be 5

200

what is the value of:

5/2

This is integer division so the answer would be 2 instead of 2.5

300

what is the value of --> int value= 100%5

0 because the % gives you the remainder of a division

400

What is the value of z when :

int y=+ 5;

int z= y%2;

First 5 is assigned to y,

then y (which is 5) is divided by 2 and since it uses the % method it would only indicate if there is a remainder. 

When their is remain it is show as a 1(for int division)

500

what is the value of: 

byte b = 1000

Wouldn't be able to be assign because this value is too large for this data type; would cause a compile error 

Terminology

100

int, double, and String are _____ 

data types

200

what are the two ways to divide in java?

Explain what they do

/ and the %

300

a ___ is called the assignment operator because it's used to assign a value to a variable.

the = sign

400

A ______  is known as a final variable

constant

500

What data type has the largest storage size?

Double

Number Systems

100

Binary(base2) --> Decimal(base10)

101010₂  --> _________₁₀

42₁₀

200

Decimal(base10) --> Binary(base2)

77₁₀  --> _________₂

1001101₂

300

Binary(base2) --> Octal(base8)

111101₂  --> _________₈

75₈

400

Hex(base16)--> Binary(base2)

FD₁₆ --> ________₂

11111101₂

500

Octal(base8) --> Hex(base16)

45₈ --> ________₁₆

25₁₆