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java – Print largest odd integer & minimum from user input

Assignment I have asks for user input of integers until ‘0’ is entered. Then these user inputs are used for 4 questions, I’ve correctly answered 2 and the other 2 I’m not getting it correct.
Q1 asks to print the minimum integer the user inputted. My code works for 3/4 test cases, the test case that doesn’t work is when only ‘0’ is entered.
Q2 asks to find the largest odd integer, my code only works for 1 of the test cases and I’m kind of lost by this one.

Test case input 1: 0
Test case input 2: -1 7 5 -9 0
Test case input 3: 6 8 10 20 0 -1 13

``````Scanner scan = new Scanner(System.in);

// initializing
int negNum = 0;
int sum = 0;
int minNum = Integer.MAX_VALUE;
int maxNum = Integer.MIN_VALUE;
int num = 10000;

// while loop asking for user input not equal to 0
while (num != 0) {
num = scan.nextInt();

// finding minimum integer
if (num == 0)
break;
if (minNum > num) {
minNum = num;
}

// finding largest odd integer
if (num %2 != 0) {
if (num > maxNum) {
maxNum = num;
}
else maxNum = 0;
}

// counting negative integers
if (num < 0) {
negNum++;
}

// finding sum of even integers
if (num % 2 == 0) {
sum = sum + num;
}
}
// printing out calculations
System.out.println("The minimum integer is " + minNum );
System.out.println("The largest odd integer in the sequence is " + maxNum );
System.out.println("The count of negative integers in the sequence is " + negNum);
System.out.println("The sum of even integers is " + sum );
``````

Some guess

The code you provide is missing important information that we must guess.

Being a programmer means being able to present the problem and the solution without ambiguity. Here is one important and some pedantic ambiguities listed.

• What type are the items referenced by `array`?

We can assume they are `int` but depending on the compiler settings your code could still work for other types. The problem may be hidden behind warnings that we can not see.

If for example the array contains `unsigned int` then adding what is a positive value (in the array) can be subtracted if the top bit is 1

• What is `row_count`, is it a static typed value, a defined value (has no type), or …?

• You provided no library references, eg `#include <stdio.h>` Yes it is a very standard include associated with `printf` but we are still left to guess this is a fact.

Rewrite

Taking your code at face value

Two bugs

1. Sum will `sum` all rows as you do not reset its value for each row.

2. The max value `temp` is initialized with the wrong value. It should have the lowest possible value. That means that `largest_row` may never get a value.

Depending on the compiler setting what is printed could be a random value, or zero.

Poor design

The code is inefficient and the naming is poor.

• `largest_row` is a function so give it a capital `Largest_row`

• `largest_row` is not what the function does. It prints the index of the largest row. Using `PrintIdxLargestRowSum` would be better however it is too long. If we make the function return the largest row, the name could be `IdxLargestSum`

• It is a little odd as you are checking for a max value as you are summing the row.

First sum the row, then check for the max value.

• Keep variables scoped as close as possible to the code they are used in. Declare sum inside the first loop.

Using your code as a template we get

``````// Assumes global row_count > 0
int Idx_largest_row(void) {
int idx, max;
for (int i = 0; i < row_count; i++) {
int sum = 0
for (int j = 0; j < row_count; j++) {
sum += array(i)(j);
}
if (i == 0 || (i > 0 && sum > max)) {
max = sum;
idx = i;
}
}
return idx;
}

// use as
printf("%in", Idx_largest_row());
``````

Example

The above rewrite is still rather poor in my view.

• There should be two functions, one to sum a row the other to find the max sum.

• The array and row counts should be an argument

• The inner arrays should be of defined length

``````#include <stdio.h>

#define COL_COUNT  5
#define uint unsigned int

int rows()(COL_COUNT) = {
{10,   2, 320, 344, -130},
{30,  12, 330, 444, -160},
{100,  2, 123, 207,   50},
{102, 82, 530, 544, -150},
{103, 72, 730, 444, -140}
};

int SumRow(int *row, uint count) {
int sum = 0;
for (uint i = 0; i < count; i++) { sum += row(i); }
return sum;
}
uint LargestRowIdx(int rows()(COL_COUNT), uint rowCount) {
uint idx = 0;
int max = SumRow(rows(0), COL_COUNT);
for (uint i = 1; i < rowCount; i++) {
int sum = SumRow(rows(i), COL_COUNT);
if (sum > max) {
max = sum;
idx = i;
}
}
return idx;
}

void main() {
printf("Index of largest sum: %un", LargestRowIdx(rows, 5));
return;
}
``````

Note that the number of rows is a magic number `5`, however you should use a defined value or variable

Note I use `unsigned int` when indexing and rather than have to type all that I use the the defined `#define uint unsigned int`. There is no reason you can not use an `int` for indexes

Note I use `camelCase` names rather than `snake_case`. Which to use is up to you

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beginner – Printing the ith row with the largest sum in a 2D array

``````void largest_row(void)
{
int largest_row, temp = 0, sum = 0;

for (int i = 0; i < row_count; i++)
{
for (int j = 0; j < row_count; j++)
{
sum += array(i)(j); //Array referenced here is globally defined
if (sum > temp)
{
largest_row = i;
}
temp = sum;
}
}

printf("%in", largest_row);

return;
}
``````

The function `largest_row()` prints the ith row of a 2d array that has the largest sum.

In what areas could my code or algorithm be improved (i.e. recursion implementation)? I think there is a better way, and I want to get exposed to well-designed codes and more efficient algorithms as I continue to learn to program.

As of now, I think I depend too much on loops and that limits my programming experience. Is it even right to think that way? For reference, and if you guys are familiar, I’m currently in week 3 of CS50x (infamous Tideman problem). I’m almost done with it but I want my code to be better. That’s the goal of my question at least if any of these is too vague already.

Cloudflare recently stopped the world’s largest DDoS attack

Earlier this summer, Cloudflare thwarted a 17.2M rps DDoS attack  the largest ever reported, the company touts in a recent blog post.

Cloudflare states its autonomous edge DDoS protection systems automatically detected and mitigated a 17.2 million request-per-second (rps) DDoS attack, an attack almost three times larger than any previous one that it’s aware of.

The attack was launched by a powerful botnet targeting a Cloudflare customer in the financial industry. Within seconds, Cloudflare reports, the botnet bombarded the Cloudflare edge with over 330 million attack requests.

For perspective, Cloudflare explained how it serves over 25 million HTTP requests per second on average, referring to the average rate of legitimate traffic in 2021 Q2. Peaking at 17.2 million rps, this attack reached 68% of its Q2 average rps rate of legitimate HTTP traffic.

The attack was automatically detected and mitigated by its autonomous edge DDoS protection systems, powered by its home-grown software-defined denial of service daemon (dosd). Cloudlfare explains that a unique dosd instance runs in every server in each one of its data centers around the world and each dosd instance independently analyzes traffic samples out-of-path, allowing it to scan asynchronously for DDoS attacks without causing latency and impacting performance.

unity – Find Largest Room in 2d World

I’m currently working on a generated(Perlin Noise) 2D Cave System with Unity.
The Caves currently look like this:

What I want to do is spawn the Player (and other stuff) in the big Part of the Cave and not the small ones, so I wanted to have some sort of List of all the Tile(positions) of the Big Room.

I thought about a Pathfinding algorithm for finding like the two furthest away points and determine the distance, but I had no clue how to find those starting points.

The final function should look like this:

``````List<Vector2> GetLargestRoom(int(,) map) // where int(x,y) is either 0 or 1 for solid/ not solid
``````

Microsoft Azure is the World’s Largest Cloud

According to recent data, Microsoft Azure is the world’s largest public cloud with \$17.7 billion in quarterly revenue.  Amazon AWS trails not far behind at \$13.3 billion.  The top five (which also includes IBM, Salesforce, and Google Cloud) combined for \$47.3 billion in sales.

Microsoft and Amazon together make up 65% of the field, with others substantially smaller.

Interestingly, despite being known as a “cloud native” company, Google has fallen further behind, selling only a quarter of cloud services that Microsoft does.

Microsoft Azure has taken an impressive lead in the industry.  When Azure launched in 2008 (several months after Google Cloud), they initially followed a PaaS strategy that was poorly received.  But after revamping their offerings, they’ve zoomed past the original cloud innovator, Amazon, effectively leveraging the natural links between their datacenter and desktop products and the cloud.

raindog308

I’m Andrew, techno polymath and long-time LowEndTalk community Moderator. My technical interests include all things Unix, perl, python, shell scripting, and relational database systems. I enjoy writing technical articles here on LowEndBox to help people get more out of their VPSes.

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Largest disk contained in an ellipsoid

It is known that any ellipsoid with principal semi-axes $$a$$, $$b$$, $$c$$ has circular planar sections (https://en.wikipedia.org/wiki/Circular_section).

• Is the largest circular disk contained within any ellipsoid given by one of its circular sections? If so, does this property hold for any quadric which has circular sections?

• What is the expression for the radius of the largest contained disk in an ellipsoid in terms of $$a$$, $$b$$, $$c$$?