Announcements

1
Announcements

• B7 tutorial today 1100-1200 in CS103
• In CSE department
• Ask at entry desk for direction to CS103

2
Unary and binary operators

• Operators acting on a single variable or an
  expression are called unary operators
• Example logical NOT, unary plus, unary minus
• boolean x true
• boolean y !x // unary logical NOT
• int z 23
• int w z // unary plus
• int k -z // unary minus or negation
• int j -z-20 // what is j -43 or -3?
• int r -(z-20) // what is r?

3
Unary and binary operators

• Operators acting on two variables or expressions
  are called binary operators
• Example add (), subtract (-), multiply (),
• Example of boolean operators (unary and binary)
• boolean x true
• boolean y !x x
• boolean z !(y x)
• boolean w !y !x
• boolean k !(y x)
• boolean p !y !x

4
Examples

• Instructor Mainak Chaudhuri
• mainakc_at_cse.iitk.ac.in

5
Printing characters

• class printcharacter
• public static void main(String arg)
• char gradeA
• System.out.println(grade) // prints A
• System.out.println((int)grade) // prints
  65
• System.out.println(gradeB) // prints
  131
• System.out.println(grade1) // prints 66
• System.out.println((char)(grade1)) //
  prints B
• Notice the type cast
• Notice the automatic type conversion

6
Printing characters

• class printcharacter
• public static void main(String arg)
• char gradeA
• System.out.println(grade)// prints A
• System.out.println(grade) // prints B
• Post-increment

7
Printing characters

• class printcharacter
• public static void main(String arg)
• char gradeA
• System.out.println(grade)// prints B
• System.out.println(grade) // prints B
• Pre-increment

8
More type cast

• class castExample
• public static void main(String arg)
• double xMath.PI // Call to Math class
• double y-Math.PI
• System.out.println(Value of PI is x)
• System.out.println((int)x) // prints 3
• System.out.println((int)y) // prints -3

9
Celsius to Fahrenheit

• class CToF
• public static void main(String arg)
• double C 40
• double F
• F (C/5.0)9.0 32
• System.out.println(C Celsius is same as
  F Fahrenheit)