How do I fix this 101 keeps showing at the end of result-CodePudding

How to remove the 101 that keeps showing on the code result? I was tasked to print the odd and even numbers from 0 - 100 but when I run my code, the number 101 keeps showing both at the end of Odd and Even results.

Here's my code so far;

public class act1 {
    public static void main(String[] args) {
        int start = 0;
        int end = 100;
        System.out.println("List of EVEN numbers");
        int evenNums = evenNumbers(start, end);
        System.out.println(evenNums);

        System.out.println("\nList of ODD numbers");
        int oddNums = oddNumbers(start, end);
        System.out.println(oddNums);
    }

    static int oddNumbers(int start, int end) {
        for (start = 0; start <= 100; start  ) {
            if (start % 2 != 0) {
                System.out.print(start   " ");
            }
        }
        return start;
    }

    static int evenNumbers(int start, int end) {
        for (start = 0; start <= 100; start  ) {
            if (start % 2 == 0) {
                System.out.print(start   " ");
            }
        }
        return start;
    }
}

CodePudding user response：

Remove those two : System.out.println(oddNums);, System.out.println(evenNums);.
It's printing 101 because when you return return start;, it will return the last index, which is the one on which the loop will break, which with this condition start <= 100 will always be 101.

So here's the function with the edit already made :

public class act1 {  
    public static void main(String[] args){ 
    int start = 0;
    int end = 100;
    System.out.println("List of EVEN numbers");         
    evenNumbers(start, end);

    System.out.println("\nList of ODD numbers");    
    oddNumbers(start, end);
}

You don't need to get the return of the two functions, you can just call those like this.

CodePudding user response：

Reconsider how a for-loop works:

for (int n=0; n<=3; n  ) {
    System.out.println(n);
}

n==0, so n<=3 is true, enter the body and print out "0", n so n==1
n==1, so n<=3 is true, enter the body and print out "1", n so n==2
n==2, so n<=3 is true, enter the body and print out "2", n so n==3
n==3, so n<=3 is true, enter the body and print out "3", n so n==4
n==4, so n<=3 is false, terminate the loop

Now the value of n==4...