Rohan G CollegeBoard Unit 4 For Loops

• For loops
  • Three Parts of a For Loop
    • Example
    • Control Flow Diagram
    • Hacks
      • - Change the code above to iterate instead from 1-5 to 10-15. (Print numbers 10-15)
      • - Convert 10 numbers of your choice from two temperature units (F to C, C to F, C to K)

For loops

• One of the most tested concepts in the APCSA exam
• Skills 3.C, 4.C, and 5.C

Three Parts of a For Loop

• Initialization of a variable
• Test condition

for (initialize; test condition; change)
{
   loop body
}

Example

for (int x = 1; x <= 5; x++) {
    System.out.println(x);
}

1
2
3
4
5

Control Flow Diagram

• The code in the initialization area is executed only one time before the loop begins
• the test condition is checked each time through the loop and the loop continues as long as the condition is true
• the loop control variable change is done at the end of each execution of the body of the loop
• When the loop condition is false, execution will continue at the next statement after the body of the loop.

Hacks

- Change the code above to iterate instead from 1-5 to 10-15. (Print numbers 10-15)

- Convert 10 numbers of your choice from two temperature units (F to C, C to F, C to K)

String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};
for (int i = 0; i < cars.length; i++) {
  System.out.println(cars[i]);
}

Volvo
BMW
Ford
Mazda