Question

Create 3 user-defined methods called add().

1 accepts a single integer array parameter; this method should loop the array adding the values and return the summation (use 4, 1, 4, 6, 10, 15, 32, 79, 18 as the values in the array)

1 accepts 2 integer parameters; this method should add them and return the value

1 accepts 3 integer parameters; this method should add them all and return the value

In main, define the parameters above (you may use random number generators if you like), output the values. Example:

Method 1 sum: 1234

Method 2 sum: 1234

Method 3 sum: 1234

Answer 1

public class AddNumbers {

    public static int add(int arr[]) {
        int sum = 0;
        for(int i = 0; i < arr.length; ++i) {
            sum += arr[i];
        }
        return sum;
    }

    public static int add(int n1, int n2) {
        return n1 + n2;
    }

    public static int add(int n1, int n2, int n3) {
        return n1 + n2 + n3;
    }

    public static void main(String[] args) {
        System.out.println("Method 1 sum: " + add(new int[] {4, 1, 4, 6, 10, 15, 32, 79, 18}));
        System.out.println("Method 2 sum: " + add(8, 4));
        System.out.println("Method 3 sum: " + add(8, 4, 7));
    }

}

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