Design a method that takes an Array

Question

Design a method M4 that takes an array A of doubles and a double value d, and returns true if d is not found in A and false if d is found in A

Example:

`M49({1.0, 4.5, 7.7, 0.3, 2.1},7.7)`//should return false

Answer 1

You need only a simple notContains function?

Java 7+:

private boolean notContains(final double[] array, final double n) {
    for (double x : array) {
        if (x == n) return false;
    }

    return true;
}

Java 8+ using the Streams API:

private boolean notContains(final double[] array, final double n) {
    return Arrays.stream(array).noneMatch(x -> x == n);
}

Usage:

final double[] array = {1.0, 4.5, 7.7, 0.3, 2.1};
System.out.println("Result is: " + notContains(array, 7.7)); // ==> false
System.out.println("Result is: " + notContains(array, 7.2)); // ==> true

Answer 2

Above answer is correct. you can also use variable length arguments(...) for your purpose but one restriction this type of parameter is last in method.

public static boolean notFind(double n,double ...arr){
    for(double d:arr){
        if(d==n)
            return false;
    }
    return true;
}

And its usages

double[] array = {1.0, 4.5, 7.7, 0.3, 2.1};
    System.out.println(notFind(7.7, array)); //false
    System.out.println(notFind(7.2, array)); //true