Loops Flashcards
Write the While Loop Structure
while(somecondition){
//repeat code in the squiggly brackets if the condition is true
}
As long as the condition is true in the ( ) of loop conditions, the code in the { } will repeat ______
indefinetly
What conditions can be placed in the ( ) of while loops?
same conditions used in if statements
What will this code do:
int intNumber;
intNumber = 3
while (intNumber <= 5){
con.println(“Wahoo”);
}
print “Wahoo” indefinetly
What will this code do:
intNumber = 5;
while (intNumber <= 5){
con.println(“Wahoo”);
}
print Wahoo indefinetly
What will this code do:
intNumber = 10;
for (intNumber <= 5){
con.println(“Wahoo”);
}
print nothing
Function of the Looping Structures
repeat whatever is in the { } as long as the condition is true
repeat whatever is in the { } as long as the condition is true
Function of the Looping Structures
When do loops (while/for) stop repeating?
Once condition inside ( ) is false
Function of Inatializing Variables
to give variables default values
number variables are usually initialized to ______
0
string variables are usually intialized to _____
empty double quotes (i.e. “”)
to give variables default values
Function of Initializing Variables
Write the code to check if a string does NOT include certain characters
!strVariable.equalsIgnoreCase(“xxx”)
Function of:
!strVariable.equalsIgnoreCase(“xxx”)
checks if a string does NOT include certain characters
Write the general structure of a for loop statement
for(intCount = #; intCount [math comparison symbol] #; intCount++/–){
// repeat code if condition is true, until it is false
}
increment symbol
++
++
increment symbol
_ _
decrement symbol
decrement symbol
_ _
3 Parts in a For Loop Condition
- Intialize Variable to Default Value
- Condition Check
- Count Up (Increment) or Count Down (Decrement)
statements that are done once are placed…
outside the { }
What does this code do:
dblTotal = dblTotal + dblNumber;
add the old value in dblTotal to dblNumber
input the result to dblTotal, giving it a new value
.length();
measures the length of any string
string logic comparison which measures the length of a string
.length();
Function of:
strVariable2 + strVariable1
attaches (concatenating) two strings together
i.e. a + b = ab
Function of (int) in the following code:
intRand = (int)(Math.random()*100 + 1);
Casting… forces the double to be an integer
- cuts off the decimals
Function of Math.random()
generates dbl numbers between 0.0000000-0.999999999
Write code which prints random ingeters between 1-100
int intRandom;
intRandom = (int)(Math.random()* 100+1);
con.println(intRandom);
Write a program that prints the largest of five entered numbers (using if statements or Math.max()).
