Program Control Flashcards
Selection statements
If and Switch
Iteration Statements
For, While, Do-While Loops
Jump Statements
Break, Continue & Return
If Statement Syntax
if (condition)
{
...
}
else
{
...
}If-Else If-Else Syntax
If (condition)
{...}
Else If (condition)
{...}
Else
{...}Switch Statement Uses
Value of an expression is tested against a list of scenarios. When a match is found, that statement sequence is executed.
Enables a program to select among alternatives.
Switch Statement Syntax
Switch(expression) {
case constant1:
Statement sequence
break;
case constant2:
statement sequence
break;
default:
statement sequence
}Valid types for switch expressions
byte, short, int, char, String
Is the default switch statement required?
No, it is optional. No action takes place if all matches fail.
Can you nest Switch Statements?
Yes
For Loop Uses
Performing a known number of iterations
For Loop Syntax
for (initialization; Boolean condition; iteration)
{
statement sequence
}
While Loop Uses
An unknown number of iterations
While Loop Syntax
While (condition)
statement;
Do-While Loop Uses
When at least one iteration is necessary in an unknown number of iterations
Do-While Loop Syntax
do {
statements;
}
while (condition);
Purpose of Break in a Loop
Force an immediate exit & bypass any remaining code.
Where does program control resume after a break?
The next statement following the Loop.
Where does program control resume after a break in an inner loop?
The next line in the outer loop.
Labeled Break
Expanded break for exiting from a deeply nested set of loops.
Syntax: break label;
The label is the name identifying a block of code.
To name a block: label: {block of code}
Continue
Bypass loop control & force an early iteration
Rare.
