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using System;
using System.Collections.Generic;
using System.Linq;
using System.Diagnostics;
public static class SumOfMultiples
{
public static int Main()
{
Profile("Justin's implementation, find multiples of 3 and 5 up to 1M, 10 times\n",
10,
() => { JSum(new[] { 2, 3, 5, 7, 11, 13 }, 1000000); }
);
Console.WriteLine($"Justin's result == {JSum(new[] { 2, 3, 5, 7, 11 }, 1000000)}");
Profile("Nick's implementation, find multiples of 3 and 5 up to 1M, 10 times\n",
10,
() => { NSum(new[] { 2, 3, 5, 7, 11, 13 }, 1000000); }
);
Console.WriteLine($"Nicks's result == {NSum(new[] { 2, 3, 5, 7, 11 }, 1000000)}");
return 0;
}
public static long JSum(IEnumerable<int> multiples, int max)
{
long sum = 0;
for(int i = 0; i < max; i++)
{
if(multiples.Any(x => i % x == 0))
{
sum += i;
}
}
return sum;
}
public static long NSum(IEnumerable<int> multiples, int max)
{
HashSet<long> result = new HashSet<long>();
foreach (int mult in multiples)
{
for (int i = 1; i < max; i++)
{
if ((i % mult == 0) && !result.Contains(i))
{
result.Add((long)i);
}
}
}
return result.Sum();
}
static double Profile(string description, int iterations, Action func) {
// warm up
func();
var watch = new Stopwatch();
// clean up
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
watch.Start();
for (int i = 0; i < iterations; i++) {
func();
}
watch.Stop();
Console.Write(description);
Console.WriteLine(" Time Elapsed {0} ms", watch.Elapsed.TotalMilliseconds);
return watch.Elapsed.TotalMilliseconds;
}
}
using System.IO;
using System;
class A
{
public void Hi()
{
Console.WriteLine("Hi");
}
}
class B:A{
}
class C:A{
}
class Program
{
static void Main()
{
A a = new A();
B b = new B();
Object o = new Object();
b.Hi();
a.Hi();
// b =a ;
o = (object)b;
a = (B)o;
a.Hi();
b.Hi();
}
}
// Fig. 8.9: Student Poll.cs
// Poll analysis app.
using System;
class StudentPoll
{
static void Main()
{
// student response array (more typically, input at runtime)
int[] responses = {1,2,5,4,3,5,2,1,3,13,1,4,3,3,3,2,3,3,2,14};
var frequency = new int[6]; // array of frequency counters
int index = -1;
// for each answer, selet responses element and use that value
// as frequency index to determine element to increment
foreach (var response in responses)
{
++index;
try
{
++frequency[response];
}
catch (IndexOutOfRangeException ex)
{
Console.WriteLine(ex.Message);
Console.WriteLine(
$"responses[{index}] = {responses[index]}\n");
}
}
Console.WriteLine($"{"Rating"}{"Frequency",10}");
// output each array element's value
for (var rating = 1; rating < frequency.Length; ++rating)
{
Console.WriteLine($"{rating,6}{frequency[rating],10}");
}
}
}
using System;
using System.Net;
using System.Text; // for class Encoding
using System.IO; // for StreamReader
class Program {
static void Main() {
var request = (HttpWebRequest) WebRequest.Create("https://www.smsgatewaycenter.com/library/send_sms_community.php");
var postData = "&UserName=sgcsms2";
postData += "&Mask=SGCSMS";
postData += "&To=7770907999";
postData += "&Type=Bulk";
postData += "&Password=SGCsms123?";
postData += "&Language=English";
postData += "&Message=Dear Parents, MARKS OF Ajay Yadav OF WEEKLY TEST I IS BELOW:\nSUB MM OM\nENGLISH 100 50 \nHindi 100 2 \nMathematics 100 90 \nSCIENCE 100 1 \nTOT MARKS: 400 MARKS OBT: 310\nPER(%): 77.5% CLASS RANK: 2\n Regards, Adarsh School Merta City";
postData += "&format=json";
var data = Encoding.ASCII.GetBytes(postData);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
using(var stream = request.GetRequestStream()) {
stream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse) request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
Console.WriteLine(responseString);
}
}
using System.IO;
using System;
using System;
using System.Collections.Generic;
namespace SortedArray
{
class Finder
{
//Array size
private int n = 3;
//Used to save location of the search result
public int resx = -1;
public int resy = -1;
//Two dimensional array
private int[,] A;
//Constructor
public Finder()
{
//Sample two dimensional array
A = new int[3, 3]
{
{ 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }
};
}
//Reset results
public void Reset()
{
resx = -1;
resy = -1;
}
//Find method using brute force
public bool BruteSearch(int x)
{
//Loop through the entire array
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n; j++)
{
if (A[i, j] == x)
{
//Save result for later access
resx = i;
resy = j;
return true;
}
}
}
//If we reach this point then the array
//does not contain the search key
return false;
}
//This method searches a given row i using
//binary search. l and r are left and right
//indices because we are going to call this
//method recursively. x the is the search key
public bool BinarySearch(int i, int l, int r, int x)
{
//Single element base case
if (l == r)
{
//Element found
if (x == A[i, l])
{
//Save results
resx = i;
resy = l;
return true;
}
else
{
return false;
}
}
else
{
//Find the middle element of the given row
int m = (l + r) / 2;
//Return if the middle element happens to be
//the key we are looking for
if (A[i, m] == x)
{
//Save result
resx = i;
resy = m;
return true;
}
//If the key is greater than the middle
//then search the right half
else if (x > A[i, m])
{
l = m + 1;
}
//Search the left half
else
{
r = m - 1;
}
//Call recursively
return BinarySearch(i, l, r, x);
}
}
}
class Program
{
static void Main(string[] args)
{
//Create a finder object
Finder finder = new Finder();
//Search for 3 using brute force
if (finder.BruteSearch(3))
{
Console.Out.WriteLine("Element found:");
Console.Out.WriteLine("Row: " + finder.resx);
Console.Out.WriteLine("Column: " + finder.resy);
}
else
{
Console.Out.WriteLine("Element not found");
}
//Reset results to start again using
//a different method
finder.Reset();
//Binary search each row
for (int i = 0; i < 3; i++)
{
if (finder.BinarySearch(i, 0, 2, 3))
{
Console.Out.WriteLine("Element found:");
Console.Out.WriteLine("Row: " + finder.resx);
Console.Out.WriteLine("Column: " + finder.resy);
return;
}
}
Console.Out.WriteLine("Element not found");
}
}
}
using System.IO;
using System;
class Program
{
static void Main()
{
Console.WriteLine("Hello, World!");
}
public bool returnTrue()
{
return true;
}
public bool returnFalse()
{
return false;
}
public int returnOne()
{
return 1;
}
public string returnString()
{
return "String";
}
}
