CSIS 110 - Lecture 11
Announcements:
Homework on course web site – due Friday
Programming assignment due next Monday
Reading: 4.1 to 4.6 (pp 79-86)
Discuss appropriate indenting – if statements, for loops, blocks
- Always indent
- Always indent by the same amount
- Closing brace in correct column
Last Time:
Arrays
- what is an array?
- How do we declare an array variable?
- How do we allocate the array elements?
- How do we access an individual element?
For Loops
A for loop allows us to execute a sequence of statements sequentially. An example:
for ( int i = 5; i < 30; i = i + 7 ) {
System.out.print( i + " " );
}
What are the parts of the for statement? [Draw Flowchart]
What does this for loop do?
How would we calculate the average of the values contained in an array?
[discuss integer division. Introduce the type double]
Operators +=, -=, *=, /=, %=
In our programs, we frequently use a variable, add a value to it, and assign the result back
into the original variable
sum = sum + theArray[i];
balance = balance + salesTax;
This is a very common type of expression, so Java provides a shorthand operator for us
