Math Class and Returns

25wi ver.

Note: this is for the Winter 2025 iteration of CSE 121. Looking for a different quarter? Please visit https://courses.cs.washington.edu/courses/cse121/.

Math Class¶

(a set of useful methods for performing mathematical operations)

Method	Returns
`Math.abs(value)`	absolute value (make nonnegative)
`Math.max(value1, value2)`	larger of two values
`Math.min(value1, value2)`	smaller of two values
`Math.pow(base, exp)`	`base` to the `exp` power
`Math.sqrt(num)`	square root of `num`

Example

// Evaluates to 8.0
double num = Math.pow(2, 3);
// Evaluates to 9.0
double big = Math.max(num, Math.sqrt(81));
System.out.println(big + " is big!");

Output

9.0 is big!

Returns¶

Declaration

public static type name(...) {
    ...
    return expression;
}

Example

public static void main(String[] args) {
    double seattleC = fToC(60.0);
    double newYorkC = fToC(50.0);

    System.out.println(seattleC);
    System.out.println(newYorkC);
}

// Converts Fahrenheit to Celsius.
public static double fToC(double degreesF) {
    double degreesC = 5.0 / 9.0 * (degreesF - 32);
    return degreesC;
}

Output

15.555555555555557
10.0