The document summarizes different types of Java operators and provides examples of their usage. It discusses arithmetic, relational, logical operators as well as assignment, conditional, and increment/decrement operators. It also covers type conversions in expressions and built-in math functions through the Math class. Examples are provided to demonstrate determining the value of arithmetic, logical expressions and a programming problem on calculating salvage value using straight-line depreciation method.

1. - Ankita Karia
Ankita R Karia 1 February 2012 1

2.  JAVA operators can be classified into a number of related
categories as below:-
 Arithmetic. + - * / %
 Relational. < <= > >= == !=
&& || !
 Logical. AND OR NOT
T && T = T F || F= F T=F
F=T
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3. ASSIGNMENT CONDITIONAL INCREMENT
= ? : ++
• Is used to exp1 ? exp2 : exp3 •PRE:- First
assign value to e.g.:- x=(a>b)?a:b subtracts 1 from
operand and then the
variable. result is assigned .
e.g.:- a =10 DECREMENT - - ++m;
•SHORTHAND
a=a+1 • PRE:- First subtracts 1 •POST:- First
assigns the value to
Can also be from operand and then the
the variable on left and
result is assigned .
written as - - m; then decrements
a+=1 operand
•POST:- First assigns the
m++
a = a / (n+1) value to the variable on left
and then decrements
operand
m-- Ankita R Karia 1 February 2012 3

4.  JAVA permits mixing of constants and variables of different
types in an expression, but during evaluation it adheres to
very strict rules of type conversion.
 If operands are of different types, the “lower” type is
automatically converted to “higher” type before the operation
proceeds. The result is of higher type.
 The final result of an expression is converted to the type of
the variable on the left of the assignment before assigning the
value
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5. EXAMPLES ACTION
x= (int) 7.5 7.5 is converted to integer by
truncation
a = (int)21.3/(int)4.5 Evaluated as 21/4 and the result
would be 5
b = (double) sum/n Division is done in floating point
mode
y = (int) (a+b) The result of a+b is converted to
integer
y = (int) a+b a is converted to integer and then
added to b
p = cost ((double)x) Converts x to double before using
it as parameter
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6.  JAVA supports basic math functions through Math class
defined in the java.lang.package.
 The functions should be used as follows:-
Math.function_name();
java.lang.Math
 Example: y = Math.sqrt(x);
Function
name
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7. FUNCTIONS ACTION
sin(x) Returns the sine of the angle x in radians
cos(x) Returns the cosine of the angle x in radians
tan(x) Returns the tangent of the angle x in radians
asin(x) Returns the angle whose sine is y
atan2(x,y) Returns the angle whose tangent is x/y
pow(x,y) Returns xy
exp(x) Returns ex
log(x) Returns the natural logarithm of x
sqrt(x) Returns square root of x
abs(x) Returns absolute of x
max(a,b) Returns maximum of1 a and b
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8.  Determine the value of the following
arithmetic expression. (a=5,b=2,c=1)
1. m = ++a*5;
2. p*=x/y; x=10,y=2,p=2;
3. s/=5; s=5;
4. n=b++-c*2;
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9. Ankita R Karia 1 February 2012 9

10. Ankita R Karia 1 February 2012 10

11.  Determine the value of the following logical
expression. (a=5,b=10,c=-6)
1. a<b && a<c;
2. a<b && a>c;
3. a= = c || b>a;
4. b>15 && c<0 || a>0;
5. (a/2.0==0.0&&b/2.0!=0.0)||c<0.0
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12. Ankita R Karia 1 February 2012 12

13. 1. The straight-line method of computing the yearly depreciation of the value of an item
is given by
depreciation = Purchase Price – Salvage Value
Years of service
Write a program to determine the salvage value of an item when the purchase price,
years of service and Annual depreciation are given
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