Using String Type in Integer Type?

Question

i have a serious problem in C# console application, the following code doesn't work as what i want... it must ask me to type the following letters value, then it must calculate with the values i typed, but when i type a character such as 'x', it doesn't make it equivalent to "1", how can i solve that problem???, what is the certain solution?? "x" value should be equivalent to 1

string nun = "2";
        Console.WriteLine("Type the 'A' value");
        double a = Convert.ToInt32(Console.ReadLine());

        if (a=='x') {

            a = 1

        }
        Console.WriteLine("Type the 'B' value");
        double b = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Type the 'C' value");
        double c = Convert.ToInt32(Console.ReadLine());


        double delta = Math.Pow(b,2) - (4*a*c);


        if(delta > 0 ) {

            double x1 = (-b + Math.Sqrt(delta) / 2 * a);
            Console.WriteLine("value of x1: {0}",Convert.ToInt32(x1));
            double x2 = (-b - Math.Sqrt(delta) / 2 * a);


            Console.WriteLine("value of x2: {0}",Convert.ToInt32(x2));
        }

        else if (delta < 0) {

            Console.WriteLine("there is no any different real root in this equation!");

        }

Why not type 1 instead of x? Your code shows that you want to allow user to enter number not any non-numeric string. — King King
– King King, Commented Sep 8, 2013 at 18:02
How can you expect a double be equal to x . double a = Convert.ToInt32(Console.ReadLine()); if (a=='x') — I4V
– I4V, Commented Sep 8, 2013 at 18:03
king king that's actual problem for me, how can i solve it ?? — user2500490
– user2500490, Commented Sep 8, 2013 at 18:04

King King · Accepted Answer · 2013-09-08 18:08:47Z

1

You can do like this:

    Console.WriteLine("Type the 'A' value");
    string s = Console.ReadLine();        
    double a = s == "x" ? 1 : Convert.ToInt32(s);

NOTE: the code doesn't care about some conversion exception, you should use try-catch to deal with it.

answered Sep 8, 2013 at 18:08

King King

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4 Comments

Alessandro D'Andria Over a year ago

I think, with the info we have, this the best solution. But i really can't understand what OP want to attain.

user2500490 Over a year ago

problem solved, thats really easy, but it didnt come to my mind ;) thanks a lot

Jeppe Stig Nielsen Over a year ago

try–catch is not optimal. You could use int.TryParse. For example: int a; if (s == "x") { a = 1; } else if (!int.TryParse(s, out a)) { /* handle wrong input */ }

King King Over a year ago

@JeppeStigNielsen it's even better to prevent user from typing any non-numeric character, don't need to use any try-catch, or TryParse.

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