Question

I need to write a program that, depending on the user’s choice, inputs an integer, double or string variable.

If the variable is int or double, the program increases it by one (+ 1).

If the variable is a string, the program appends "*" at the end (+ "*").

Afterwards, I need to print the result at the console.

I must use switch statement.

Examples:

program	user		program	user
Please choose a type: 1 --> int 2 --> double 3 --> string	3		Please choose a type: 1 --> int 2 --> double 3 --> string	2
Please enter a string:	hello		Please enter a double:	1.5
hello*			2.5

 

Answer 1

Here is my solution with the switch statement (sometimes the best option compared to the if-else statement):

using System;

class PlayWithIntDoubleAndString
{
    static void Main()
    {
        Console.WriteLine("Please choose your input data type:\n 1 --> int\n 2 --> double\n 3 --> string\n ...and hit ENTER");
        int choice = int.Parse(Console.ReadLine());

        switch (choice)
        {
            case 1:
                Console.WriteLine("Please enter your INTEGER number: ");
                int a = int.Parse(Console.ReadLine());
                Console.WriteLine("The result is: {0}",(a+1));
                break;
            case 2:
                Console.WriteLine("Please enter your DOUBLE number: ");
                double b = double.Parse(Console.ReadLine());
                Console.WriteLine("The result is: {0}", (b+1));
                break;
            case 3:
                Console.WriteLine("Please enter your STRING: ");
                string c = Console.ReadLine();
                Console.WriteLine("The result is: {0}", c + "*");
                break;

            default: Console.WriteLine("Invalid!");
                break;
        }
    }
}

Answer 2

Here is the same task - solved with if statments:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


class Task
{
    static void Main()
    {
        Console.WriteLine("Please choose a type:\n1 --> int\n2 --> double\n3 --> string");
        int choice = int.Parse(Console.ReadLine());

        if (choice ==1)
        {
            Console.WriteLine("Please enter an integer:");
            int inputInt = int.Parse(Console.ReadLine());
            inputInt += 1;
            Console.WriteLine(inputInt);
            return;
        }
        else if (choice ==2)
        {
            Console.WriteLine("Please enter a double:");
            double inputDbl = double.Parse(Console.ReadLine());
            inputDbl += 1;
            Console.WriteLine(inputDbl);
            return;
        }
        else if (choice==3)
        {
            Console.WriteLine("Please enter a string:");
            string inputStr = Console.ReadLine();
            string addInputStr = inputStr + "*";
            Console.WriteLine(addInputStr);
            return;
    }
}