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2.4 Iteration — for is a compact while

Lesson

A counted for is just a while with the three parts gathered onto one line. Both run the body the same number of times.

// for
for (int i = 0; i < n; i++) {
    body;
}

// equivalent while
int i = 0;
while (i < n) {
    body;
    i++;
}

▶ Try it: run this — it counts the even numbers from 1 to 10 (there are 5). Change the 10 and re-run.

int c = 0;
for (int i = 1; i <= 10; i++) {
    if (i % 2 == 0) {
        c++;
    }
}
System.out.println(c);

Which while loop matches for (int i = 0; i < n; i++) { body }?

Check answer

Match each for loop to how many times its body runs.

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True or false?

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Order the parts as they appear in a for-loop header: for ( _ ; _ ; _ ).

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Type exactly what this program prints.

public class Main { public static void main(String[] a){
    for (int i = 2; i <= 6; i = i + 2) {
        System.out.println(i);
    }
}}

Check answer