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1.4 Arithmetic — compound assignment

Lesson

x += 5 is shorthand for x = x + 5: take the current value, add 5, store it back. The same works for -=, *=, and /=.

int x = 10;
x += 5;   // x is now 15
x -= 3;   // x is now 12
x *= 2;   // x is now 24

▶ Try it: run this, then change something and run it again.

int x = 4;
x += 10;
System.out.println(x);
x *= 3;
System.out.println(x);

What does this print?

int x = 10;
x += 5;
System.out.println(x);

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x += 1 is exactly the same as which line?

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Type exactly what this prints:

int x = 4;
x *= 3;
System.out.println(x);

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What does this print?

int x = 20;
x /= 4;
System.out.println(x);

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Match each compound assignment to the same thing written out in full.

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