4.3.The switch Statement
Another form of selection statement is the switch statement, which executes a set of logic depending on the value of a given parameter. The types of the values a switch statement operates on can be booleans, enums, integral types, and strings. Lesson 2: Operators, Types, and Variables discussed the bool type, integral types and strings and Lesson 17: Enums will teach you what an enum type is. Listing 3-2 shows how to use the switch statement with both int and string types.
Listing 3-1. Switch Statements:
using System;
namespace CSharp
{
class switch_Selection
{
static void Main(string[] args)
{
int day;
again:
Console.Write("Enter Number of Day: ");
day = int.Parse(Console.ReadLine());
switch (day)
{
case 1: Console.WriteLine("That's Monday");
break;
case 2: Console.WriteLine("That's Tuesday");
break;
case 3: Console.WriteLine("That's Wednesday");
break;
case 4: Console.WriteLine("That's Thursday");
break;
case 5: Console.WriteLine("That's Friday");
break;
case 6: Console.WriteLine("That's Saturday");
break;
case 7: Console.WriteLine("That's Sunday");
break;
default: Console.WriteLine("Your input allowd 1 to 7 only, Please try again");
goto again;
}
Console.ReadKey();
}
}
}
Listing 3-2. Switch Statements:
using System;
namespace CSharp
{
class switch_Selection1
{
static void Main(string[] args)
{
char symbol;
double v1, v2, result;
top:
Console.Write("Enter V1: ");
v1 = double.Parse(Console.ReadLine());
again:
Console.Write("Enter V2: ");
v2 = double.Parse(Console.ReadLine());
Console.WriteLine("You can use calculate symbol like: +,-,*,/");
Console.Write("Enter calculate symbol: ");
symbol = Console.ReadKey().KeyChar;
Console.WriteLine();
switch(symbol)
{
case '+': result = v1 + v2; break;
case '-': result = v1 - v2; break;
case '*': result = v1 * v2; break;
case '/':
if(v2==0)
{
Console.WriteLine("Can not Divided by zero, Please try again!");
goto again;
}
else
{
result = v1 / v2;
}
break;
default: Console.WriteLine("That's allowed only 4 symbols like + - * / only, Please try again!");
goto top;
}
Console.WriteLine("Result of Calculate is: {0}", result);
Console.ReadKey();
}
}
}
Example 1: Windows Forms Application:
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