Exercise
Function Calculator, Params And Return Value Of Main
Objetive
Create a C# program to calculate a sum, subtraction, product or division, analyzing the command line parameters:
calc 5 + 379
(Parameters must be a number, a sign, and another number; allowed signs are + - * x / )
This version must return the following error codes:
1 if the number of parameters is not 3
2 if the second parameter is not an accepted sign
3 if the first or third parameter is not a valid number
0 otherwise
Example Code
using System;
public class exercise126
{
public static int Main(string[] args)
{
if (args.Length != 3)
{
Console.WriteLine("Error!");
Console.WriteLine("Usage: number1 operand number2");
Console.WriteLine("Where operand can be + - / * x ·");
return 1;
}
try
{
int number1 = Convert.ToInt32(args[0]);
int number2 = Convert.ToInt32(args[2]);
switch (args[1])
{
case "+":
{
Console.WriteLine(number1 + number2);
break;
}
case "-":
{
Console.WriteLine(number1 - number2);
break;
}
case "/":
{
Console.WriteLine(number1 / number2);
break;
}
case "*":
case "x":
case "·":
{
Console.WriteLine(number1 * number2);
break;
}
default:
{
Console.WriteLine("Error!");
Console.WriteLine("Operand must be + - / * x or ·");
return 2;
break;
}
}
}
catch (Exception)
{
Console.WriteLine("Error!");
Console.WriteLine("Not a valid number");
return 3;
}
return 0;
}
}