Programming Fundamentals/Variable Examples CSharp
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Overview
[edit | edit source]The following examples demonstrate data types, arithmetic operations, and input in C#.
Data Types
[edit | edit source] // This program demonstrates variables, literal constants, and data types.
using System;
public class DataTypes
{
public static void Main(string[] args)
{
int i;
double d;
string s;
Boolean b;
i = 1234567890;
d = 1.23456789012345;
s = "string";
b = true;
Console.WriteLine("Integer i = " + i);
Console.WriteLine("Double d = " + d);
Console.WriteLine("String s = " + s);
Console.WriteLine("Boolean b = " + b);
}
}
Output
[edit | edit source]Integer i = 1234567890 Double d = 1.23456789012345 String s = string Boolean b = True
Discussion
[edit | edit source]Each code element represents:
//
begins a commentusing System
allows references toBoolean
andConsole
without writingSystem.Boolean
andSystem.Console
public class DataTypes
begins the Data Types program{
begins a block of codepublic static void Main()
begins the main functionint i
defines an integer variable named i;
ends each line of C# codedouble d
defines a double floating-point variable named dstring s
defines a string variable named sBoolean b
defines a Boolean variable named bi = , d = , s =, b =
assign literal values to the corresponding variablesConsole.WriteLine()
calls the standard output write line function}
ends a block of code
Arithmetic
[edit | edit source] // This program demonstrates arithmetic operations.
using System;
public class Arithmetic
{
public static void Main(string[] args)
{
int a;
int b;
a = 3;
b = 2;
Console.WriteLine("a = " + a);
Console.WriteLine("b = " + b);
Console.WriteLine("a + b = " + (a + b));
Console.WriteLine("a - b = " + (a - b));
Console.WriteLine("a * b = " + a * b);
Console.WriteLine("a / b = " + a / b);
Console.WriteLine("a % b = " + (a + b));
}
}
Output
[edit | edit source]a = 3 b = 2 a + b = 5 a - b = 1 a * b = 6 a / b = 1 a % b = 5
Discussion
[edit | edit source]Each new code element represents:
+, -, *, /, and %
represent addition, subtraction, multiplication, division, and modulus, respectively.
Temperature
[edit | edit source] // This program converts an input Fahrenheit temperature to Celsius.
using System;
public class Temperature
{
public static void Main(string[] args)
{
double fahrenheit;
double celsius;
Console.WriteLine("Enter Fahrenheit temperature:");
fahrenheit = Convert.ToDouble(Console.ReadLine());
celsius = (fahrenheit - 32) * 5 / 9;
Console.WriteLine(
fahrenheit.ToString() + "° Fahrenheit is " +
celsius.ToString() + "° Celsius" + "\n");
}
}
Output
[edit | edit source]Enter Fahrenheit temperature: 100 100° Fahrenheit is 37.7777777777778° Celsius
Discussion
[edit | edit source]Each new code element represents:
Console.ReadLine()
reads the next line from standard inputConvert.ToDouble
converts the input to a double floating-point value