using System; public class Example2DemonstratesVariables { public static void Main() { int x; int y; x = 10; Console.WriteLine("x contains " + x); y = x / 2; Console.Write("y contains x / 2: "); Console.WriteLine(y); } }
Software Development
software development notes, main category for Cs, Java, and other programming experiences.
Comparing integers using if statements, equality operators, and relational operators.
using System; public class Comparison { public static void Main( string[] args ) { int number1; int number2; Console.Write( "Enter first integer: " ); number1 = Convert.ToInt32( Console.ReadLine() ); Console.Write( "Enter second integer: " ); number2 = Convert.ToInt32( Console.ReadLine() ); if ( number1 == number2 ) Console.WriteLine( "{0} == {1}", number1, number2 ); if ( number1 != number2 ) Console.WriteLine( "{0} != {1}", number1, number2 ); if ( number1 < number2 ) Console.WriteLine( "{0} < {1}", number1, number2 ); if ( number1 > number2 ) Console.WriteLine( "{0} > {1}", number1, number2 ); if ( number1 <= number2 ) Console.WriteLine( "{0} <= {1}", number1, number2 ); if ( number1 >= number2 ) Console.WriteLine( "{0} >= {1}", number1, number2 ); } }
Calculating the product of three integers.
using System; public class Product { public static void Main(string[] args) { int x; int y; int z; int result; Console.Write("Enter first integer: "); x = Convert.ToInt32(Console.ReadLine()); Console.Write("Enter second integer: "); y = Convert.ToInt32(Console.ReadLine()); Console.Write("Enter third integer: "); z = Convert.ToInt32(Console.ReadLine()); result = x * y * z; Console.WriteLine("Product is {0}", result); } }
Call methods from primitive data types
using System; using System.Collections.Generic; using System.Text; class Program { static void Main(string[] args) { Console.WriteLine(12.GetHashCode()); Console.WriteLine(12.Equals(23)); Console.WriteLine(12.GetType().BaseType); Console.WriteLine(12.ToString()); Console.WriteLine(12); // ToString() called automatically. } }
Assign value to int variable
using System; class UnaryOpsApp { static void Main(string[] args) { int a; a = -42; Console.WriteLine("{0}", a); } }
Check IndexOutOfRangeException
using System; public class MainEntryPoint { public static void Main() { string userInput; while (true) { try { Console.Write("Input a number between 0 and 5 " + "(or just hit return to exit)> "); userInput = Console.ReadLine(); if (userInput == "") break; int index = Convert.ToInt32(userInput); if (index < 0 || index > 5) throw new IndexOutOfRangeException("You typed in " + userInput); Console.WriteLine("Your number was " + index); } catch (IndexOutOfRangeException e) { Console.WriteLine("Exception: Number should be between 0 and 5. " + e.Message); } catch (Exception e) { Console.WriteLine("An exception was thrown. Message was: " + e.Message); } catch { Console.WriteLine("Some other exception has occurred"); } finally { Console.WriteLine("Thank you"); } } } }
Convert Hex char To Int
#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the “Software”), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
using System;
using System.Collections.Generic;
using System.Text;
namespace Newtonsoft.Json.Utilities
{
internal class MathUtils
{
public static int HexToInt(char h)
{
if ((h >= '0') && (h <= '9'))
{
return (h - '0');
}
if ((h >= 'a') && (h <= 'f'))
{
return ((h - 'a') + 10);
}
if ((h >= 'A') && (h <= 'F'))
{
return ((h - 'A') + 10);
}
return -1;
}
}
}
[/csharp]