How to convert a string to an integer inside C#

Question

I am trying to make an example formula console calculator and can't find out how to convert the output of the Console.ReadLine() to a integer. Here is a sample of code that I tried.

    int A;
    Console.WriteLine("What is number A?");
    String numA = Console.ReadLine();
    Convert.ToInt32(numA) == A;

Well you're calling a reasonable method (although I'd use `int.Parse`) but you need to *assign* the value to `A`. I would suggest at this point reading an introductory book on C#.... Stack Overflow isn't a good place to learn the basics of a language. — Jon Skeet, Nov 27 '16 at 21:52
`Convert.ToInt32(numA) == A;` converts the value entered (`string`) into `int`, then `==` operator compares it with *garbage* (`A` is not initialize) so you have `bool` value which you *throw away* - `;` — Dmitry Bychenko, Nov 27 '16 at 22:10

Dmitry Bychenko · Answer 1 · 2016-12-16T08:52:38.410

1

You can implement it like this:

int A;

do {
  Console.WriteLine("What is number A?");
}
while (!int.TryParse(Console.ReadLine(), out A));

keep asking user until he/she enters the integer value

edited Dec 16 '16 at 08:52

answered Nov 27 '16 at 22:03

Dmitry Bychenko

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score 0 · Answer 2 · answered Nov 27 '16 at 21:52

0

int.Parse(numA)

or...

int i;
if (int.TryParse(numA, out i) {
    // parsed correctly
}

answered Nov 27 '16 at 21:52

jleach

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score -1 · Answer 3 · edited Dec 27 '16 at 05:44

-1

Try this

int A;
 Console.WriteLine("What is number A?");
 String numA = Console.ReadLine();
A = Int32.Parse(numA);`

edited Dec 27 '16 at 05:44

Yanga

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answered Nov 27 '16 at 22:06

Lucia panagiaotopoulou

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I fixed it. I found a quick tutorial on C# and have fixed it. No need for more help. – TechGamer238 Dec 06 '16 at 00:18

How to convert a string to an integer inside C#

3 Answers3