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 coins than both of them. For example:
Data input:
3
John
Dan
Sam
9
10
8
Data output:
John 1
Dan 3
Sam 1
My output is just the names of the students.
I wrote this code:
using System;
class Program
{
private static void Main(string[] args)
{
int n = Convert.ToInt32(Console.ReadLine());
var numberCoins = new int[n];
string[] studentNames = new string[n];
numberCoins[0] = 1;
for (int i = 0; i < n; i++)
{
studentNames[i] = Console.ReadLine();
}
int[] grades = new int[n];
for (int i = 0; i < n; i++)
{
grades[i] = Convert.ToInt32(Console.ReadLine());
}
for (int i = 1; i < n; i++)
{
if (grades[i] > grades[i - 1])
{
numberCoins[i] = numberCoins[i - 1] + 1;
}
}
for (int i = n - 2; i >= 0; i--)
{
if (grades[i] > grades[i + 1])
{
numberCoins[i] = numberCoins[i + 1] + 1;
}
}
for (int i = 0; i < n; i++)
{
Console.WriteLine(studentNames[i], " ", numberCoins[i]);
}
Console.ReadLine();
}
}
You didn't mention if there is any pattern to give coins to the students. And if we have specific number of coins or not.
If we consider at first no one has any coins the result must be something like the following:
Please specify the number of the students:
3
Please write students' name (after each name hit the ENTER):
John
Dan
Sam
Please write students' ratings (after each rating hit the ENTER):
9
10
8
The result:
John: 0
Dan: 2
Sam: 0
I wrote a piece of code which might help you approach the functionality you want.
using System;
class Program
{
public static void Main(string[] args)
{
Console.WriteLine("Please specify the number of the students:");
int n = int.Parse(Console.ReadLine());
string[] studentNames = new string[n];
int[] studentRatings = new int[n];
int[] studentCoins = new int[n];
Console.WriteLine();
Console.WriteLine("Please write students' name (after each name hit the ENTER):");
for (int i = 0; i < n; i++)
{
studentNames[i] = Console.ReadLine() ?? string.Empty;
}
Console.WriteLine();
Console.WriteLine("Please write students' ratings (after each rating hit the ENTER):");
for (int i = 0; i < n; i++)
{
studentRatings[i] = int.Parse(Console.ReadLine());
}
Console.WriteLine();
Console.WriteLine("The result:");
for (int i = 0; i < n; i++)
{
int coins = 1;
studentCoins[i] = 0;
if (i != 0)
if (studentRatings[i] > studentRatings[i - 1])
coins++;
if (i != n - 1)
if (studentRatings[i] > studentRatings[i + 1])
coins++;
studentCoins[i] = coins;
}
for (int i = 0; i < n; i++)
{
Console.WriteLine($"{studentNames[i]}: {studentCoins[i]}");
}
}
}
Related
I have this problem and I'm stuck. I'm a beginner in software development.
You get a list of N students and a list of grades for each student. Every student gets coins. A student which has bigger grade than his neighbors from list earns more coins than them. Find the coins which every student must receive. I have to give students coins which has bigger grade.
Data input
3
Ionel
Mihai
Elena
9
10
8
Data output
Ionel 1
Mihai 3
Elena 1.
Here is my code.
static void Main(string[] args)
{
int number = Convert.ToInt32(Console.ReadLine());
string[] studentsList = FillArray(number);
int[] studentsGrades = ConvertList(FillArray(number));
PrintResult(studentsList, GetCoins(studentsGrades));
}
static string[] FillArray(int number) // filling array with names of students
{
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[] GetCoins(int[] input) // this is the method where I'm stuck.
{
int[] coins = new int[input.Length];
for (int i = 0; i < coins.Length; i++)
{
coins[i] = 1;
}
for (int i = 0; i < input.Length; i++)
{
if (i > 0 && (input[i] > input[i - 1]))
{
if (coins[i] <= coins[i - 1])
{
coins[i] = coins[i - 1] + 1;
}
}
if (i < input.Length - 1 && input[i] > input[i + 1])
{
if (coins[i] == coins[i + 1])
{
coins[i]++;
}
if (i > 0 && input[i] > input[i-1])
{
coins[i - 1]++;
}
}
}
return coins;
}
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);
}
}
}
}
The program displays
Ionel 1
Mihai 2
Elena 1.
// this is wrong.
The correct answer is
Ionel 1
Mihai 3
Elena 1
// the correct answer
I'm not sure, but the problem is at the GetCoins method. Please help.
Thanks!
Okay so basically i have this code where i need to enter 7 numbers from 0-37 and i dont want any other numbers to be entered, ive tried doing it with if/else statement and do/while but i cant exactly get it right, i want it to go on until u enter 7 numbers from 0-37. How can i do this?
static void Main(string[] args) {
int[] numbers = new int[7];
Console.WriteLine("Enter a number between 0-37");
for (int i = 0; i < numbers.Length; i++) {
Console.WriteLine($"Enter {i + 1} number");
numbers[i] = Convert.ToInt32(Console.ReadLine());
}
}
Just try this:
for (int i = 0; i < numbers.Length; i++)
{
Console.WriteLine($"Enter {i + 1} number");
while (!int.TryParse(Console.ReadLine(), out var number) || number < 0 || number > 37)
{
Console.WriteLine($"invalid number ");
}
numbers[i] = number;
}
Try this:
static void Main(string[] args)
{
int[] numbers = new int[7];
Console.WriteLine("Enter a number between 0-37");
bool IsGoodNumber(int n) => n >= 0 && n <= 37;
for (int i = 0; i < numbers.Length; i++)
{
do
{
Console.WriteLine($"Enter {i + 1} number");
numbers[i] = Convert.ToInt32(Console.ReadLine());
} while (!IsGoodNumber(numbers[i]));
}
}
Another way would be:
static void Main(string[] args)
{
int[] numbers = new int[7];
Console.WriteLine("Enter a number between 0-37");
bool IsGoodNumber(int n) => n >= 0 && n <= 37;
for (int i = 0; i < numbers.Length; i++)
{
while(true)
{
Console.WriteLine($"Enter {i + 1} number");
numbers[i] = Convert.ToInt32(Console.ReadLine());
if (IsGoodNumber(numbers[i]))
break;
Console.WriteLine("Invalid number");
}
}
}
This was a small problem the teacher gave us at school. We were asked to make a program which keeps asking the user to input test scores until he inputs -99 to stop the program. The values are stored in an array and the highest, lowest and average scores are displayed.
The problem I have with my code is that whenever I run it it always gives me a value of 0 for lowest scores even though there are no zeros in the input. Can anyone please point out the mistake in my code?
Code:
static void Main(string[] args)
{
int[] za = new int[100];
scores(za, 0);
}
public static void scores(int[] ar, int x)
{
Console.Write("Please enter homework score [0 to 100] (-99 to exit): ");
int a = Convert.ToInt16(Console.ReadLine());
if (a != -99)
{
ar[x] = a;
x++;
scores(ar, x);
}
else
{
Console.Clear();
Console.WriteLine("Homework App");
int[] arr = new int[x];
foreach (int l in arr)
{
arr[l] = ar[l];
}
int lowest = arr[0];
for (int i = 1; i < arr.Length; i++)
{
if (lowest > arr[i]) { lowest = arr[i]; }
}
int highest = arr[0];
for (int j = 1; j < arr.Length; j++)
{
if (highest < arr[j]) { highest = arr[j]; }
}
double sum = 0;
double nums = 0;
for (int k = 0; k < arr.Length; k++)
{
sum = sum + arr[k];
nums++;
}
double average = sum / nums;
Console.WriteLine("Highest Score: {0}", highest);
Console.WriteLine("Lowest Score: {0}", lowest);
Console.WriteLine("Average Score: {0}", average);
Console.ReadLine();
}
}
When you're copying items, don't use a foreach loop and then the element stored in the array as the index that you're inserting to. Instead, use a for loop with a counter variable.
You should change this:
int[] arr = new int[x];
foreach (int l in arr)
{
// You're using the wrong value for the index here.
// l represents the value of the item stored in `arr`, which is `0`
arr[l] = ar[l];
}
To this:
int[] arr = new int[x];
for (var counter = 0; counter < x; counter++)
{
arr[counter] = ar[counter];
}
I have this function to initiate a two dimensional array:
static Array Matrix(int Rows, int Columns)
{
int[,] LotteryArray = new int[Rows,Columns];
for (int i = 0; i < LotteryArray.GetLength(0); i++)
{
for (int j = 0; j < LotteryArray.GetLength(1); j++)
{
LotteryArray[i, j] = RandomNum(1, 46);
Console.Write("{0,3},", LotteryArray[i, j]);
}
Console.WriteLine();
}
return LotteryArray;
}
Then I have this which is supposed to give me a one dimensional array and see how many numbers in the winning array are in the matrix:
int RowNum = 1;
int Prediction = 0;
Console.WriteLine("Your winning numbers are!");
Console.WriteLine("------------------------");
int[] Winner = new int[6];
for (int i = 0; i < Winner.Length; i++) //this loop is to initiate and print the winning numbers
{
Winner[i] = RandomNum(1, 46); //the numbers are supposed to be between 1 and 45, so i tell it to do it until 46 because the upper limit is exclusive
Console.Write("{0,3},", Winner[i]);
}
Console.WriteLine();
Console.WriteLine("------------------------"); //these two lines are for aesthetics
Matrix(Rows, Columns);
foreach (int i in Winner)
{
for (int j = 0; j<LotteryArray; j++)
{
if (Winner[i] == j)
{
Prediction++;
if (j % 6 == 0) { RowNum++; }
}
Console.WriteLine("you got {0} correct prediction in row number {1}",Prediction,RowNum);
RowNum = 1;
}
}
It's telling me LotteryArray doesn't exist in the current context.
LotteryArray is a variable within another method. You cannot access it in the scope you are showing.
You can do get the return from your method into a variable and then use it.
var LotteryArray = Matrix(Rows, Columns);
foreach (int i in Winner)
{
for (int j = 0; j<LotteryArray; j++)
{
if (Winner[i] == j)
{
Prediction++;
if (j % 6 == 0) { RowNum++; }
}
Console.WriteLine("you got {0} correct prediction in row number {1}",Prediction,RowNum);
RowNum = 1;
}
}
LotteryArray is a variable declared in Matrix method, and is not visible outside.
I have a one assignment
I have to make one dimension array with 20 numbers - first 10 numbers are from 1 do 10. others 10 numbers I have to get in method called Dopolni - where I have to sum together array with one another like - p11 = p0+p1, p12 = p1+p2, p14 = p2+p3 and so on - I dont know how to arrange it to get those other 10 numbers - help please
my code till now is
static void Dopolni(int[] p)
{
for (int i = 11; i < 20; i++)
{
p[i] = p[i] + 1;
}
}
static void Main(string[] args)
{
int[] p = new int[20];
for (int i = 1; i < 20; i++)
{
if (i <= 10)
{
p[i] += i;
}
Console.WriteLine("{0}", p[i]);
}
Dopolni(p);
Console.WriteLine(p);
Console.ReadKey(true);
}
All numbers I have to write out in main window. Hope someone can help out
The indices of the first 10 numbers range from 0 to 9, the others from 10 to 19. But since you always sum two consecutive numbers, you will only get 9 sums! In order to get 10 sums, you could start by summing 0 with p[0]:
int previous = 0;
for (int i = 0; i < 10; i++) {
p[i + 10] = previous + p[i];
previous = p[i];
}
public static void Main()
{
int[] p = new int[20];
for (int i = 0; i < 10; i++)
{
p[i] = i + 1;
ยจ
Console.WriteLine(p[i]);
}
Dopolni(p);
}
static void Dopolni(int[] p)
{
for (int i = 10; i < 20; i++)
{
p[i] = p[i - 10] + p[i - 9];
Console.WriteLine(p[i]);
}
}
This looks like trouble:
int[] p = new int[20];
Console.WriteLine(p);
What you want is to loop through p and print each element, not rely on the array implementation of ToString().
Try:
foreach (var n in p)
Console.WriteLine(n);
Do you need to have it in a function? Its really quite simple...
Notice I use 'out int[]', thats what your missing in your code. Out specifies you want in/out param, not just in ;)
static void Main()
{
int[] p = new int[20];
// First 10 numbers
for (int i = 0; i < 10; i++)
p[i] = i + 1;
Dolpini(out p);
foreach (int m in p)
Console.WriteLine(m);
}
static void Dolpini(out int[] numbers)
{
// Next 10 numbers
for (int k = 10; k < 20; k++)
p[k] = p[k-10] + p[k-9];
}