Question

JAVA~

1. Write a static method named countOdd(my_array) that returns the number of odd integers in a given array. If there are no odd numbers in the array, the method should return 0. If the array is empty, the method should also return 0.

For example:

Test	Result
System.out.println(countOdd(new int[]{2, 3, 5, 6}));	2
System.out.println(countOdd(new int[]{2}));	0
System.out.println(countOdd(new int[]{}));	0

System.out.println(countOdd(new int[]{-7, 2, 3, 8, 6, 6, 75, 38, 3, 2}));

4

public static int

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2.

Write a static method named repeats_exist(numbers) that takes an array of integers as a parameter and returns true if there are any repeated values in the array, and false if all of the values in the array are unique. Note: you can assume that the array is not empty and the method returns a boolean value.

For example:

Test	Result
System.out.println(repeats_exist(new int[]{2, 3, 4, 5, 6}));	false
System.out.println(repeats_exist(new int[]{2, 3, 4, 3, 6}));	true

public static boolean

Answer 1

Screenshot of code1:

output:

code:

import java.util.Scanner;
class Main
{
public static void main(String args[])
{
int n,i;
Scanner sc=new Scanner(System.in);
System.out.print("Enter number of elements in array: ");
n=sc.nextInt();
if(n==0)
{
System.out.print("No of odd elements in array is: "+countOdd(a,n));
return;
}
int a[]=new int[n];
System.out.print("Enter elements in array: ");
for(i=0;i<n;i++)
a[i]=sc.nextInt();
System.out.print("No of odd elements in array is: "+countOdd(a,n));
}
static int countOdd(int a[],int n)
{
int i,c;
c=0;
for(i=0;i<n;i++)
{
if(a[i]%2!=0)
c++;
}
return c;
}
}

Screenshot of code2:

output:

code:

import java.util.Scanner;
class Main
{
public static void main(String args[])
{
int n,i;
Scanner sc=new Scanner(System.in);
System.out.print("Enter number of elements in array: ");
n=sc.nextInt();
int a[]=new int[n];
System.out.print("Enter elements in array: ");
for(i=0;i<n;i++)
a[i]=sc.nextInt();
System.out.print("Result is: "+repeats_exist(a,n));
}
static boolean repeats_exist(int a[],int n)
{
int i,j;
for(i=0;i<n;i++)
{
for(j=i+1;j<n;j++)
{
if(a[i]==a[j])
return true;
}
}
return false;
}
}

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