The for Loop

1
The for Loop

• Syntax
• for (expression1condition expression2)
• statement
• for (expression1condition expression2)
• statement
• statement
• Same as
• expression1
• while (condition)
• statement
• expression2

2
Example for Loop

• int numEmployees,curNum
• System.out.print(Enter Number of Employees )
• numEmployees scan.nextInt()
• if (numEmployees gt 0)
• for (curNum 0 curNum lt numEmployeescurNum)
  
• System.out.println( Welcome to CorpLand! )

3
Looping for Input

• char letterEntered A
• String stringE
• while (letterEntered ! Z)
• System.out.print(Enter a letter )
• stringE scan.next()
• letterEntered stringE.charAt(0)

4
Looping until Flag

• boolean noMoreData()
• boolean done false
• while (!done)
• // do a bunch of stuff
• if (noMoreData() true)
• done true
• System.out.println( Were all through thank
  you!)

5
Nested Loops

• int i , j
• for (i0 i lt 10 i)
• for (j0 j lt 10 j)
• System.out.print(i)
• System.out.print(j)
• System.out.print( )
• System.out.println()

6
The do-while Loop

• Syntax
• do
• statement
• while (condition)
• do
• statement
• statement
• while (condition)

7
do-while Example

• char letterEntered
• String stringE
• do
• System.out.print(Enter a letter )
• stringE scan.next()
• letterEntered stringE.charAt(0)
• while (letterEntered ! Z)

8
What Is This?

• while (!stringEntered.equals(apple))
• System.out.println( Enter a red fruit )
• stringEntered scan.next()
• while (!stringEntered.equals(banana))
• System.out.println(Enter a yellow fruit )
• stringEntered scan.next()
• while (!stringEntered.equals(pomegranate))
• System.out.println(Enter a random fruit )
• stringEntered scan.next()

9
What Is This?

• for (i 0 i lt 10 i)
• System.out.println( Interesting, isnt it?)
• while (answer.charAt(0) ! D)
• System.out.print( Enter an answer )
• answer scan.next()
• while (answer.charAt(0) ! D)
• System.out.print( Enter an answer )
• answer scan.next()

10
What Is This?

• void
• kingsChair(int loopCounter)
• int num
• for(num 0 num lt loopCounter num)
• System.out.println(AAAAAAAAAAAAAAAAAAAAAAAA
  AA)