Java method assignment

Q1 - Write a Java method to compute the average of three numbers
i/p=25
45
65

o/p=45

import java.util.Scanner;
public class Test{
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
System.out.println(“Enter the three numbers: ”);
int a = scn.nextInt();
int b = scn.nextInt();
int c = scn.nextInt();
System.out.print(avg(a, b, c));
}
public static int avg(int a, int b, int c){
return (a+b+c)/3;
}
}
Input:

Expected Output:
Code:
Assignment Solutions

Cracking the Coding Interview in JAVA - Foundation

Q2 - Write a Java method to count all vowels in a string
(consists of all lowercase letters)
coding
2

import java.util.Scanner;
public class Test{
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
System.out.println(“Enter the string: ”);
String s = scn.nextLine();
System.out.print(count(s));
}
public static int count(String s){
int count = 0;
for(int i = 0; i < s.length(); i++){
char ch = s.charAt(i);
if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u'){
count++;
}
}
return count;
}
}
Input:
Output:
Expected Code:
Assignment Solutions

Cracking the Coding Interview in JAVA - Foundation

Q3 - Write a Java method to display the middle character of a string.
Note: a) If the length of the string is even there will be two middle characters.
b) If the length of the string is odd there will be one middle character.
350

5

import java.util.Scanner;
public class Test{
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
System.out.println(“Enter the string: ”);
String s = scn.nextLine();
System.out.print(middle(s));
}
public static String middle(String s){
if(s.length() % 2 == 0){
return s.substring(s.length()/2, s.length()/2 + 2);
}else{
return s.substring(s.length()/2, s.length()/2 + 1);
}
}
}
Input:
Output:
Expected Code:
Assignment Solutions

Cracking the Coding Interview in JAVA - Foundation

Q4 - Write a Java method to check whether a year (integer) entered by the user is a leap year or not.
2017

False

import java.util.Scanner;
public class Test{
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
System.out.println(“Enter the year: ”);
int year = scn.nextInt();
System.out.print(is_LeapYear(year));
}
public static boolean is_LeapYear(int y){
boolean a = (y % 4) == 0;
boolean b = (y % 100) != 0;
boolean c = ((y % 100 == 0) && (y % 400 == 0));
return a && (b || c);
}
}
Input:
Output:
Expected Code:

//year is leap if it is perfectly divisible by 4, then by 100, then by 400, if not at any
step, it is not a leap year
Assignment Solutions

Cracking the Coding Interview in JAVA - Foundation
Q5 - Write a Java method to find the smallest number among three numbers.
25
37
29

25

import java.util.Scanner;
public class Test{
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
System.out.println(“Enter the three numbers: ”);
int a = scn.nextInt();
int b = scn.nextInt();
int c = scn.nextInt();
System.out.print(smallest(a, b, c));
}
public static int smallest(int a, int b, int c){
return Math.min(a, Math.min(b,c));
}
}