In the above Java program to display the first 50 pentagonal numbers, we first need to understand what is pentagon? A pentagonal number is a figurative number that extends the concept of triangular and square numbers to the pentagon, but, unlike the first two, the patterns involved in the construction of pentagonal numbers are not…
In the above Java program to count all vowels in a string we use built-in function count() and with the help of a counter variable, calculate each and every vowel. Sample Output: Input the string: welcome To the world of java Number of Vowels in the string: 9
In the above Java program to print a right angles triangle from a number, we have use nested loop where i is row and j is column in that row. Sample Output: Input number of rows : 10 1 12 123 1234 12345 123456 1234567 12345678 123456789 12345678910