This program will sort numbers and depending if they are greater than or less than 100, put them into their own array.
The problem I have is printing this array. I would like the last number on the line, to not be followed by a space. I have tried many many times to get this to work now and figured I'd ask here.
I know of Console.Write("\b"); but I prefer to find a way of editing the loop so I don't have to do this. Here is the code:
using System;
using System.Linq;
class SplitArray
{
public static void Main(string[] args)
{
int[] myArray = GetNumbersFromConsole();
int[] smallNumbers = new int[myArray.Length];
int[] bigNumbers = new int[myArray.Length];
int bigIndex = 0;
int littleIndex = 0;
for (int i = 0; i < myArray.Length; i++)
{
if(myArray[i] > 100)
{
bigNumbers[bigIndex++] = myArray[i];
}
else if(myArray[i] < 100)
{
smallNumbers[littleIndex++] = myArray[i];
}
}
Console.Write("Big: ");
for (int i = 1; i < bigIndex; ++i)
{
Console.Write(bigNumbers[i]);
Console.Write(" ");
}
Console.WriteLine();
//Console.WriteLine($"{bigNumbers[0]}");
Console.Write("Little: ");
for (int i = 0; i < littleIndex; i++)
{
Console.Write($"{smallNumbers[i]}");
Console.Write(" ");
}
Console.ReadLine();
}
static int[] GetNumbersFromConsole()
{
int count = int.Parse(Console.ReadLine());
int[] result = new int[count];
for (int i = 0; i < count; ++i)
{
result[i] = int.Parse(Console.ReadLine());
}
return result;
}
}
You could just capture your Console.Write(" "); in an if statement.
if(i != littleIndex - 1)
{
Console.Write(" ");
}
littleIndex - 1 is the last time your loop executes, so this will just prevent it from adding the trailing white space. Just do the same for your big numbers as you're printing them out.
There is a builtin utility string.Join
var str = string.Join(" ",bigNumbers);
Console.WriteLine("Big: " + str);
I was playing around some more and just thought I'd try posting the first object in the array before running this loop (also changed loop so the first item didn't get printed twice).
Thank you everyone - I solved it! :)
using System;
using System.Linq;
namespace Arrays
{
class SplitArray
{
public static void Main(string[] args)
{
int[] myArray = GetNumbersFromConsole();
int[] smallNumbers = new int[myArray.Length];
int[] bigNumbers = new int[myArray.Length];
int bigIndex = 0;
int littleIndex = 0;
for (int i = 0; i < myArray.Length; i++)
{
if(myArray[i] > 100)
{
bigNumbers[bigIndex++] = myArray[i];
}
else if(myArray[i] < 100)
{
smallNumbers[littleIndex++] = myArray[i];
}
}
Console.Write("Big: ");
Console.Write($"{bigNumbers[0]} ");
for (int i = 1; i < bigIndex; i++)
{
Console.Write(bigNumbers[i]);
if (i != bigIndex - 1)
{
Console.Write(" ");
}
}
Console.WriteLine();
Console.Write("Little: ");
Console.Write($"{smallNumbers[0]} ");
for (int i = 1; i < littleIndex; i++)
{
Console.Write($"{smallNumbers[i]}");
if (i != littleIndex - 1)
{
Console.Write(" ");
}
}
Console.ReadLine();
}
static int[] GetNumbersFromConsole()
{
int count = int.Parse(Console.ReadLine());
int[] result = new int[count];
for (int i = 0; i < count; ++i)
{
result[i] = int.Parse(Console.ReadLine());
}
return result;
}
}
}
Related
I'm stuck at this. I`m beginner into software development.
You get a list of N students and then a list of ratings for each student. A student which has bigger rating than his neighbour from list gets more candies than both of them. For example:
Data input:
3
John
Michael
Sam
9
10
8
Data Output:
John 1
Michael 3
Sam 1
I wrote this code, but I'm missing something:
using System.Diagnostics.CodeAnalysis;
using System.IO.Pipes;
{
int number = Convert.ToInt32(Console.ReadLine());
string[] studentsList = FillArray(number);
int[] studentsGrades = ConvertList(FillArray(number));
PrintResult(studentsList, CountCandies(int number));
}
static string[] FillArray(int number)
{
string[] result = new string[number];
for (int i = 0; i < number; i++)
{
result[i] = Console.ReadLine();
}
return result;
}
static int[] ConvertList(string[] array)
{
int[] result = new int[array.Length];
for (int i = 0; i < array.Length; i++)
{
result[i] = Convert.ToInt32(array[i]);
}
return result;
}
static int[] GetGrades(int number) // give grades of each student
{
int[] result = new int[number];
for (int i = 0; i < number; i++)
{
result[i] = Convert.ToInt32(Console.ReadLine());
}
return result;
}
static int CountCandies(int[] arr, int number) // this is the method where I'm stuck.
{
int sum = 0;
int[] ans = new int[number];
for (int i = 0; i < number; i++)
{
ans[i] = 1;
}
for (int i = 0; i < number-1; i++)
{
if (arr[i+1] > arr[i])
{
ans[i+1] =ans[i] +1;
}
}
for (int i = number-2; i>=0; i--)
{
if (arr[i] > arr[i+1] && ans[i] <= ans[i+1])
{
ans[i] = ans[i+1] +1;
}
sum += ans[i];
}
sum += ans[number-1];
return sum;
}
static void PrintResult(string[] array, int[] array2) // print the final result
{
for (int i = 0; i < array.Length; i++)
{
array[i] += " " + array2[i];
}
foreach (string student in array)
{
Console.WriteLine(student);
}
}
You definitely need an object to hold your data.
public class StudentRating
{
public string StudentName {get;set;}
public int Rating {get;set;}
}
protected List<StudentRating> studentsRating = new List<StudentRating>();
public static void Main(string[] args)
{
GeteringInformation();
//after this do what you want with your data
}
protected static GeteringInformation()
{
Console.WriteLine("Student name:");
int rating =Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Rating");
string name =Console.ReadLine();
studentsRating.Add(new StudentRating(){StudentName=name,Rating=rating});
Console.WriteLine("Next? (Y/N)");
if(Console.ReadLine().ToLower()="y")
GeteringInformation();
}
I've been working on a sorting algorithm and one condition says that the elements in the array should be program generated.
This is the code I've been working on.
int f;
Console.WriteLine("Enter how many elements you want to be sorted:");
f = Convert.ToInt32(Console.ReadLine());
int[] myArray = new int[f];
int smallest, tmp;
Console.WriteLine("Unsorted List");
foreach (int a in myArray)
Console.Write(a + " ");
for (int i = 0; i < myArray.Length - 1; i++)
{
smallest = i;
for (int j = i + 1; j < myArray.Length; j++)
{
if (myArray[j] < myArray[smallest])
{
smallest = j;
}
tmp = myArray[smallest];
myArray[smallest] = myArray[i];
myArray[i] = tmp;
}
}
Console.WriteLine("\nSorted List Using Selection Sort:");
for (int i=0; i < myArray.Length; i++)
{
Console.Write(myArray[i] + " ");
The result of this program is just 0. How can I make the elements in array program generated? Is there a specific code block?
Please note we should use i < myArray.Length to Iterate the array instead of i < myArray.Length-1.
You can try the following code to add the elements in program generated array.
static void Main(string[] args)
{
int f;
Console.WriteLine("Enter how many elements you want to be sorted:");
f = Convert.ToInt32(Console.ReadLine());
int[] myArray = new int[f];
int temp = 0;
int minIndex = 0;
Console.WriteLine("Unsorted List");
for (int i = 0; i < myArray.Length; i++)
{
myArray[i] = Convert.ToInt32(Console.ReadLine());
}
for (int i = 0; i < myArray.Length; i++)
{
minIndex = i;
for (int j = i; j < myArray.Length; j++)
{
if (myArray[j] < myArray[minIndex])
{
minIndex = j;
}
}
temp = myArray[minIndex];
myArray[minIndex] = myArray[i];
myArray[i] = temp;
}
Console.WriteLine("\nSorted List Using Selection Sort:");
for (int i = 0; i < myArray.Length; i++)
{
Console.Write(myArray[i] + " ");
}
Console.ReadKey();
}
Besides, I have modified the related code about Selection Sort, which makes it can produce the correct sort.
Result:
Update for generate the random array:
int f;
Console.WriteLine("Enter how many elements you want to be sorted:");
f = Convert.ToInt32(Console.ReadLine());
int[] myArray = new int[f];
Random randNum = new Random();
for (int i = 0; i < myArray.Length; i++)
{
myArray[i] = randNum.Next(1, 100);
}
Console.WriteLine("The radnom array is ");
foreach (var item in myArray)
{
Console.WriteLine(item);
}
I wrote a merge sort program, but I have problems calling It from another class. I need help. For some reason after I enter the size and the max number a get a black screen in the output. I believe that the solution is pretty easy, but I can't find the solution by myself
This is the class where It sorts the numbers
class MergeSort
{
public int[] Sort(int[] unsortedSequence)
{
int[] left;
int[] right;
int[] result = new int[unsortedSequence.Length];
if (unsortedSequence.Length <= 1)
return unsortedSequence;
int midPoint = unsortedSequence.Length / 2;
left = new int[midPoint];
if (unsortedSequence.Length % 2 == 0)
right = new int[midPoint];
else
right = new int[midPoint + 1];
for (int i = 0; i < midPoint; i++)
left[i] = unsortedSequence[i];
int x = 0;
for (int i = midPoint; i < unsortedSequence.Length; i++)
{
right[x] = unsortedSequence[i];
x++;
}
left = Sort(left);
right = Sort(right);
result = merge(left, right);
return result;
}
public static int[] merge(int[] left, int[] right)
{
int resultLength = right.Length + left.Length;
int[] result = new int[resultLength];
int indexLeft = 0, indexRight = 0, indexResult = 0;
while (indexLeft < left.Length || indexRight < right.Length)
{
if (indexLeft < left.Length && indexRight < right.Length)
{
if (left[indexLeft] <= right[indexRight])
{
result[indexResult] = left[indexLeft];
indexLeft++;
indexResult++;
}
else
{
result[indexResult] = right[indexRight];
indexRight++;
indexResult++;
}
}
else if (indexLeft < left.Length)
{
result[indexResult] = left[indexLeft];
indexLeft++;
indexResult++;
}
else if (indexRight < right.Length)
{
result[indexResult] = right[indexRight];
indexRight++;
indexResult++;
}
}
return result;
}
}
And this is the class where I'm trying to call the mergesort
class Program
{
static void Main(string[] args)
{
Console.Write("How Many Random Numbers Would you like to Generate : ");
int n = Convert.ToInt32(Console.ReadLine());
Console.Write("What is the Maximum Random Number Would you like to Generate : ");
int max = Convert.ToInt32(Console.ReadLine());
Console.Clear();
int[] unsortedSequence = generateRandomSequence(n, max);
MergeSort mergeSortEngine = new MergeSort();
int[] mergeSortedArray = mergeSortEngine.Sort(unsortedSequence);
Console.Write("Output for Merge Sort: \n\n");
OutputSequence(mergeSortedArray);
Console.WriteLine("\n\nPress Any Key to Continue...");
Console.ReadKey();
Console.Clear();
Because you didn't provide them, I wrote the missing generateRandomSequence() and OutputSequence methods in order to test your code and I can't reproduce your issue. Perhaps you should compare these to your own:
static int[] generateRandomSequence(int count, int max)
{
Random rn = new Random();
int[] seq = new int[count];
for (int i = 0; i < count; ++i)
{
seq[i] = rn.Next(0, max + 1);
}
return seq;
}
static void OutputSequence(int[] array)
{
for (int i = 0; i < array.Length; ++i)
{
if (i > 0)
{
Console.Write(", ");
}
Console.Write(array[i]);
}
Console.WriteLine();
}
Output from your code using the above methods:
It looks like you missing generateRandomSequence(n, max);
It might be like
public static int[] generateRandomSequence(int n, int max)
{
var rnd = new Random();
int[] seq = new int[n];
for (int ctr = 0; ctr < n; ctr++)
{
seq[ctr] = rnd.Next(1, max + 1);
}
return seq;
}
Then, in Program/Test class after Console.Write("Output for Merge Sort: \n\n"); you can iterate with foreach loop to display the sorted array.
foreach (var item in mergeSortedArray)
{
Console.WriteLine("{0}", item);
}
//OutputSequence(mergeSortedArray);
I'm working on this simple C# program adding elements to an array. I allow the user to enter 5 numbers, and if the user enters an INVALID valid I have a message for that. My issue is that whether the users enters an invalid number or not I still want to add 5 numbers to my array.
My code works, but let's say the user enters 3 numbers and then 2 words and I end up having ONLY 3 numbers, but I want the 5 numbers no matter what. What am I doing wrong?
Here's my code:
int[] numbers = new int[5];
for (int i = 0; i < 5; i++)
{
Console.WriteLine("Enter a number: ");
string c = Console.ReadLine();
int value;
if (int.TryParse(c, out value))
{
numbers[i] = value;
}
else
{
Console.WriteLine("You did not enter a number\n");
}
}
for (int i = 0; i < numbers.Length; i++ )
{
Console.Write(numbers[i] + " ");
}
You can reduced increment count by 1, when user inputs wrong/no number.
Also note, you are code currently reading input only for 4(not 5 as question description says.) numbers.
int[] numbers = new int[4];
for (int i = 0; i < 4; i++)
{
Console.WriteLine("Enter a number: ");
string c = Console.ReadLine();
int value;
if (int.TryParse(c, out value))
{
numbers[i] = value;
}
else
{
i--;
Console.WriteLine("You did not enter a number\n");
}
}
for (int i = 0; i < numbers.Length; i++ )
{
Console.Write(numbers[i] + " ");
}
try using do-while
int[] numbers = new int[4];
int i = 0;
do
{
Console.WriteLine("Enter a number: ");
string c = Console.ReadLine();
int value;
if (int.TryParse(c, out value))
{
numbers[i] = value;
i++;
}
else
{
Console.WriteLine("You did not enter a number\n");
}
} while (i < 5);
Console.WriteLine("\nYour entered numbers are\n");
for (int j = 0; j < numbers.Length; j++ )
{
Console.Write(numbers[j] + " ");
}
You could use while loop here. See the below code
int[] numbers = new int[5];
int i = 0;
while (i < 5) {
Console.WriteLine ("Enter a number: ");
string c = Console.ReadLine ();
int value;
if (int.TryParse (c, out value)) {
numbers[i] = value;
i++;
} else {
Console.WriteLine ("You did not enter a number\n");
}
}
for (i = 0; i < numbers.Length; i++) {
Console.Write (numbers[i] + " ");
}
You can reduce the code using while loop. Also its better to change the last for loop to foreach
int[] numbers = new int[5];
int i = 0;
while (i < 5)
{
Console.WriteLine("Enter a number: ");
string c = Console.ReadLine();
int value;
if (!int.TryParse(c, out value)) continue;
numbers[i] = value;
i++;
}
foreach (int t in numbers)
Console.Write(t + " ");
I have a program here that need some improvements. This Program inputs 5 elements in an Array and Removes if any duplicates. It works but the problem is that it sets every duplicate to zero. I don't want to display zero. I want it completely destroyed and eliminated. I don't want that duplicate element to appear. This is what I have so Far! Could Use some help. Thank You.
// Gurpreet Singh
// Duplicate Program
using System;
class duplicate
{
static void Main()
{
const int Array_Size = 5;
int [] number = new int [Array_Size];
int i;
for ( i = 0; i < Array_Size; i++)
{
Console.Write("Element " + i + ": ");
number[i] = Int32.Parse(Console.ReadLine());
if (number[i] < 9 || number[i] > 101)
{
Console.WriteLine("Enter Number between 10 - 100");
number[i] = Int32.Parse(Console.ReadLine());
}
}
for (i = 0; i < Array_Size; i++)
{
for (int j = 0; j < Array_Size; j++)
{
if (i != j)
{
if (number[j] == number[i])
number[j] = 0;
}
}
}
Console.WriteLine("Duplicate Removed:");
for (i = 0; i < Array_Size; i++)
{
Console.WriteLine("Element " + i + " " + number[i]);
}
Console.ReadLine();
}
}
The easiest way is to use Linq's Distinct method:
number = number.Distinct().ToArray();
This will return a new array without any duplicates.
The duplicate is displayed as zero, since you assign the value of the duplicate to be zero, in the line,
if(number[j]==number[i])
number[j]=0
to delete the element from the array, use the following code:
if(number[j]==number[i])
{
int k=j;
while(k<Array_Size-1)
{
number[k]=number[k+1];
k++;
}
Array_Size--;
}
the statement Array_Size--; is done so that the last element is not repeated twice
This is my complete code in which I put some double-for-loop statement to
prevent it from inserting the duplicated integers in an array.
Have a look.
class Program
{
static void Main(string[] args)
{
const int ARRAY_SIZE = 5;
int[] ArrayTable = new int[ARRAY_SIZE];
int Element=0;
int a;
for(a=0; a<ArrayTable.Length;a++)
{
Console.Write("Please Enter an integer (between 10-100): ");
Element = Int32.Parse(Console.ReadLine());
while (Element < 10 || Element > 100)
{
Console.Write("Try again (between 10-100): ");
Element = Int32.Parse(Console.ReadLine());
}
ArrayTable[a] = Element;
for (int b = 0; b < a; b++)
{
while (ArrayTable[a] == ArrayTable[b])
{
Console.Write("Integer Duplicated!\nTry again: ");
Element = Int32.Parse(Console.ReadLine());
ArrayTable[a] = Element;
Console.WriteLine();
while (Element < 10 || Element > 100)
{
Console.Write("Try again (between 10-100): ");
Element = Int32.Parse(Console.ReadLine());
ArrayTable[a] = Element;
}
}
}
}
for (int c = 0; c < ArrayTable.Length; c++)
{
Console.Write("{0} ", ArrayTable[c]);
}
}