Correction to page 49

SeanDunn · September 22nd, 2009, 03:26 AM

Not that it is that important but if you wanted to reuse the code.

The text in the WriteLine for subtraction states that you subtract firstNumber from secondNumber when infact the code subtracts secondNumber from firstNumber.

Will · September 23rd, 2009, 04:47 PM

I noticed this as well it should be:

Code:

double firstNumber, secondNumber;
            string userName;
            Console.WriteLine("Enter your name");
            userName = Console.ReadLine();
            Console.WriteLine("welcome {0}!", userName);
            Console.WriteLine("Now give me a number:");
            firstNumber = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("now give me another number:");
            secondNumber = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("the result of subtracting {0} and {1} is {2}.", firstNumber, secondNumber,
                firstNumber - secondNumber);
            Console.ReadKey();

sh_erfan · November 7th, 2009, 04:45 AM

As will said the code is correct.It states that you subtract secondNumber from firstNumber.

pay attention to this code:
x=firstNumber - secondNumber;
this means that you lessen socondNumber from firstNumber and assign it to x(a vriable to hold value).so the statement we order the compiler to do in this code is "subtract secondNumber form firstNumber".

I hope could help

Erfan...

jawadh_khan786 · January 3rd, 2010, 01:00 AM

Hello C# learners and programmers

Depending on your query here... please pay attention on the page no. 47, and in the table provide observe carefully the second row on -(subtraction operator)

Operator is:

Code:

category: Binary
Eg Expression:

Code:

 var1 = var2 - var3

Result:
var1 is assigned the value that is the value of var3 subtracted from the value of var2.

Example:

if we want to subtract 5(firstNumber) from 10(secondNumber) then the code below is invalid

Code:

Console.WriteLine("The result of subtracting {0} from {1} is: {2}.", firstNumber, secondNumber, firstNumber - secondNumber);

Execution of above code gives annoying result

Code:

 The result of subtracting 5 from 10 is: -5

Hence the code below is perfectly valid

Code:

 Console.WriteLine("The result of subtracting {0} from {1} is: {2}.", firstNumber, secondNumber, secondNumber - firstNumber);

Cheers!!!
Regards C# expert
SparkSoftÂ®