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2.1 Selection — if / else

Lesson

else gives an alternative that runs when the condition is false. Exactly one of the two branches runs — never both, never neither.

int x = -3;
if (x > 0) {
    System.out.println("positive");
} else {
    System.out.println("not positive");
}

x is -3, so x > 0 is false: the else branch runs and it prints not positive.

▶ Try it: run this, then flip x between negative and positive — exactly one of the two lines prints each time.

int x = -3;
if (x > 0) {
    System.out.println("positive");
} else {
    System.out.println("not positive");
}

What does the code above print when x is -3?

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What does the same code print when x is 7?

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True or false?

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Type exactly what this prints:

int x = 4;
if (x % 2 == 0) {
    System.out.println("even");
} else {
    System.out.println("odd");
}

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For if (x > 0) ... else, sort each value of x by which branch runs.

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