For Loops

The For Loop¶

(repeats a group of statements a fixed number of times)

for (initialization; test; update) {
    statement;
    ...
    statement;
}

Example

for (int i = 1; i <= 10; i++) {
    System.out.println(i + " squared is " + (i * i));
}

For Loop Control Flow Diagram¶

Flow chart of for loop control with 5 steps explained below — (Step 1) First, perform the initialization once at the beginning.

(Step 2) Then test: is the test true?

(Step 3) If the test is true, execute the statements inside the for loop body.

(Step 4) Perform the update and go back to Step 2.

(Step 5) If the test is not true, execute the statements that are immediately after the for loop body.

Ways to Increment and Decrement the Update Variable¶

Statement	Description
`i++`	increment i by 1; same as `i = i + 1`
`i += 1`	increment i by 1; same as `i = i + 1`
`i--`	decrement i by 1; same as `i = i - 1`
`i -= 1`	decrement i by 1; same as `i = i - 1`