Modulo Operator (%)

The modulo operator % returns the remainder of a division operation. It's useful for game calculations, circular indexing, and determining even/odd numbers.

Syntax

dividend % divisor

Examples

Basic modulo operations:

let a = 10 % 3;        // a = 1 (10 divided by 3 is 3 remainder 1)
let b = 15 % 5;        // b = 0 (15 divided by 5 is 3 remainder 0)
let c = 7 % 4;         // c = 3 (7 divided by 4 is 1 remainder 3)

print(a, b, c);        // Output: 1 0 3

Game Use Cases

Checking if a number is even or odd:

let score = 42;
if (score % 2 == 0) {
    print("Even score!");
} else {
    print("Odd score!");
}

Circular array indexing (wrap around):

let colors = ["red", "green", "blue"];
let playerIndex = 5;
let colorIndex = playerIndex % len(colors);
print(colors[colorIndex]);  // Output: blue (index 2)

Limiting a value to a range:

// Keep angle within 0-360 degrees
let angle = 450;
let normalized = angle % 360;
print(normalized);  // Output: 90

Float Support

The modulo operator works with both integers and floats. If either operand is a float, the result is a float:

let x = 10.5 % 3;      // x = 1.5 (float result)
let y = 10 % 3.2;      // y = 0.4 (float result)

Edge Cases