30-Days-of-Code

30 days of Java programming challenge

Day	Questions
01	Write a function that takes in a number and return true if the number is even, false if it is odd.
02	Write a function that takes in a string and return true if the string is empty, false otherwise.
03	Write a function that checks if a given number is prime or not.
04	Write a function that takes in an array of numbers and returns the sum of the numbers.
05	Write a function that checks if a number is positive or negative.
06	Write a function that finds the maximun and minimum number in an array.
07	Write a function that sorts an array of numbers in ascending or descending order.
08	Write a function that finds the factorial of a given number.
09	Write a function that returns the length of a given string.
10	Write a function that checks if a given number is a multiple of both 3 and 5
11	Write a function that checks the given year is a leap year or not.
12	Write a function that takes in a number and print the fibonacci series till the number.
13	Write a function that search an element in an array.
14	Write a function that converts a string to uppercase.
15	Write a function that converts a string to lowercase.
16	Write a function that checks the given input character is vowel or consonent .
17	Write a function that reverse a number.
18	Write a function that find the duplicate characters in a string.
19	Write a function that copy all elements of one array into second array.
20	Write a function that calculate the square root of the given number.
21	Write a function that remove spaces from a String.
22	Write a function that count the number of vowels, consonants, and spaces in that string.
23	Write a function that calculate the area of the circle.
24	Write a function that check the number is Armstrong number or not.
25	Write a function that find the missing number in array.
26	Write a function that swap two numbers.
27	Write a function that find the greater number among the four number.
28	Write a function that Find the longest word.
29	Write a function that print the number triangle pattern.
30	Write a function that print the Rhombus Pattern.