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I use Programmr.com to improve my skills. I have a problem with this exercise.
Question:
Write the program which takes input 10 elements in the array and
reverse the elements in the array without using any other array.
Example :
1.If user gives input 1,2,3,4,5,5,4,7,3,6 then output should be in this format: 6 3 7 4 5 5 4 3 2 1
2.If user gives input 25,23,,26,12,45,65,58,24,27,13 then output should be in this format: 13 27 24 58 65 45 12 26 23 25
Note : Make sure the output format is same as above given example.
My code:
using System;
class ReverseArray{
static void Main(string[] args){
int[] arr = new int[10];
for(int i =0;i<10;i++)
{
Console.WriteLine("Enter the array elements["+i+"]:");
arr[i]=int.Parse(Console.ReadLine());
}
//write your logic here
for(int i = arr.Length-1; i >= 0; i--)
{
Console.Write(arr[i] + " ");
}
//end
for(int i =0;i<10;i++)
{
Console.Write(arr[i]+" ");
}
}
}
Programmr doesn't pass task and write that there are undefined errors. I also tried method Array.Reverse.
Use Linq reverse method and string.join
You can:
Using System.Linq;
Console.WriteLine(String.Join(" ", arr.Reverse()));
That will reverse the array and print the list separated by spaces to the console
Related
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Im new to programming and sorry if I cant explain properly. I am trying to iterate through a list that has items in it in multiples of 9. So the list can have 9,18,27.. items.
I have the code working for it to read when there is 9 using this dictionary. But I would like it work for any amount in multiples of 9.
var alphabets = new Dictionary<int, string>()
{
{1,"A2"},{2,"B2"},{3,"C2"},{4"D2"},
{5,"E2"},{6,"F2"}, {7,"G2"},{8,"H2"},
{9,"I2"}
};
So for example if there was 18 items it would like this dictionary to have this function.
var alphabets2 = new Dictionary<int, string>()
{
{1,"A2"},{2,"B2"},{3,"C2"},{4"D2"},
{5,"E2"},{6,"F2"}, {7,"G2"},{8,"H2"},
{9,"I2"},
{10,"A3"},{11,"B3"},{12,"C3"},{13"D3"},
{14,"E3"},{15,"F3"}, {16,"G3"},{17,"H3"},
{18,"I3"}
};
Thank you
As #DiplomacyNotWar commented, it sounds as if you need to input int value to convert to a correlating string value which is uniformly based on multiples of 9. If this is the case, I agree with #DiplomacyNotWar that you don't need to store anything but create a function to output the needed string value based on an int value. Here is a function that will output the pattern in your examples.
// value should be 0
string ConvertIntToSpecificString(int value)
{
// this will give you an int value 0-8
var modValue = (value - 1) % 9;
// The unicode for 'A' is 65
var firstCharValue = (char)(65 + modValue);
// This will return a whole number giving the iteration count. FE: 19 / 9 = 2
// Adding 2 to fit the pattern stated in the examples.
var secondValue = ( value / 9 ) + 2 ;
return $"{firstCharValue}{secondValue}";
}
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What will be the regular expression for value Range from 1 - 1440? (Integer)
I think this will do it. I'm running tests. I'm acting under the assumption you will not have numbers padded with zero like "0999"
"^([1-9]|[1-9][0-9]|[1-9][0-9][0-9]|1[0-3][0-9][0-9]|14[0-3][0-9]|1440)$"
breakdown:
[1-9] obvious
[1-9[0-9] allow 10 to 19
[1-9][0-9][0-9] allow 100 to 199
1[0-3][0-9][0-9] allow 1000 to 1399
14[0-3][0-9] allow 1400 to 1439
1440 obvious
Appears to work:
using System;
using System.Text.RegularExpressions;
public class Program
{
public static void Main()
{
for(int i = 0;i < 10000;i++)
{
if(Regex.IsMatch(i.ToString(),"^([1-9]|[1-9][0-9]|[1-9][0-9][0-9]|1[0-3][0-9][0-9]|14[0-3][0-9]|1440)$"))
{
Console.WriteLine(i);
}
}
}
}
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I need to write a program which count sum of numbers divided by 4. I'm really beginner in C#.
Could you lead me to solve this problem?
I write something like this but I don't know what next and there is one problem because I put only two numbers but numbers could be a lot of.
Console.WriteLine("number a");
int a = int.Parse(Console.ReadLine());
Console.WriteLine("number b");
int b = int.Parse(Console.ReadLine());
int sum = a + b;
int result = sum / 4 ;
Console.WriteLine ( "result is="+ result ) ;
use
double sum = Console.ReadLine().Split().Sum(x => int.Parse(x)) / 4.0;
Than you can enter any space separated array like
1 3 5 7
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I have two arrays -
int[] array1 = { 1, 2};
int[] array2 = { 6, 7};
I want to write them in text file delimited by tab.
Final Result -
1 6
2 7
Please suggest how to do this?
Assuming both arrays are of the same length:
File.WriteAllLines(filename,
Enumerable.Range(0, arr1.Length)
.Select(i => string.Format("{0}\t{1}", arr1[i], arr2[i]));
You could do something like this:
public void writeFile(int[] array){
using (streamWriter sw = new StreamWriter(filename, true){
for(int i = 0; i < array.Length; i++){
sw.WriteLine(array[i] + "\t");
}
}
}
Then you would just call the write method like this:
writeFile(array1);
writeFile(array2);
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I have an array of strings that has a number at the beginning, followed by a name. How can I sort the array numerically; ie
40 Mike, 25 Tyson, 9 Jackson, 5 Phillip, 3 Mitchell
as opposed to
9 Jackson, 5 Phillip, 40 Mike, 3 Mitchell, 25 Tyson
using System;
using System.Collections.Generic;
public class Test
{
public static void Main()
{
string[] items = {"10", "1", "30", "-5"};
Array.Sort(items, (x, y) =>
{
int xNum = int.Parse(x);
int yNum = int.Parse(y);
return Comparer<int>.Default.Compare(xNum, yNum);
});
foreach(var item in items)
Console.WriteLine(item);
}
}
var sorted = yourArray.OrderBy(x => int.Parse(x.Split()[0])).ToArray();
You can use SortedDictionary data structure to obtain an array sorted.