Introduction to Java Loops

Post by Basit Khan on January 16, 2017

Dr. Quayle,

after attending the java loops, I had a following exercise to solve;

In one of the introductory courses in a university, passing students are assigned a final grade of the uppercase letter P or lowercase p while failing students are assigned the letter F or f. Write a Java program that asks the user to enter grades (P/p or F/f) for 30 students, then calculates and displays both percentages of the passing and failing students.

I tried to solve it but to be honest I struggle to apply the syntax and formula. My main issue is that after reading and listening to the lecture I'm not able to apply it to create a program, kindly Help!

thanks
Omair

Post by Malik Hall on September 23, 2015

Hi Professor Quayle,
I saw an example in a textbook that I did not understand about loops. This example showed SENTINELs, DecimalFormat, Scanners, and the highlighted word new. Could you explain these to me please because I have a difficult time understanding these in class since my teacher uses SENTINELs and Scanners in his examples.

https://drive.google.com/file/d/0B4eQm5IOB_khdFRFQTVFTUlZaTQ/view?usp=sharing

Post by Zelong Zhao on March 9, 2014

well, all of questions above are very cool.

I still cannot understand what means of "break" and "returen"
What should I do?
I am not a english native speaker, so which book should I read. PS: In my personal dictionary, "understand" means I know What is it && Why we need it.
For example, What is the logic form of Break and Returen? Why Java includes those.

I know those are big questions and even do not be included in AP Subscribes but I really want to try to know those.


It is honor to get your lessons.

Post by Ashna Ayub on November 17, 2013

Professor Quayle,

I have been able understand how to write a for loop in terms of syntax, but I don't really understand how to read the code which is why I am stuck on this problem:

Consider the following array:

int[] a = { 1,2,3,4,5,4,3,2,1, 0 }

What is the value of total after the following loops complete? (by looking at the for loop)

int total = 0;
for (int i = 0; i < 10 ; i = i +2 ) {total = total + a[i]; }

Could you please explain how to find the total by looking at the loop?

Post by William Gould on October 13, 2012

Dr Quayle,

I am doing an assignment that doesn't seem to be working and i wanted to ask if you could help me understand whats going on.
my assignment is to develop a new class called MathTasks and create a method called productFor, productWhile, and productDoWhile that has a strictly positive integer parameter n and computes and returns the product of all the integers from 1 to n (inclusive of n).

here is my code so far (its very messy so far because im brand new to coding)

public class MathTasks
{
public MathTasks()
{ }
public void productFor(int n) {
for (int i = 1; (1 > 0) && (i <= n); i++)
{
System.out.print (n * 1);
System.out.print ("n = " + n);
} }
public void productWhile(int n)
{
while ((1 > 0) && (i <= n)){
{
System.out.print (n * 1);
System.out.print ("n = " + n);
}
}
}
public void productDoWhile (int n) {
if (n > 0) {
}
do {
System.out.print(n * 1);
System.out.print("n = " + n); }
while ((1 > 0) && (i <= n));
} }

Could you help explain to me how this works and what i am doing wrong?

Post by Brad Cherry on September 17, 2012

I am currently doing something like this and I am just beginning to understand this but I am still a bit lost, I use JCreator java program and I go with my class and I am stressed out and over worked any way I can keep up we get homework every Monday and it is due the next Tuesday and we get more than a few programs to make and that for me is too much pressure since I have little java experience