C# 帮助声明变量我将其初始化为

Question

I'd like to declare an int variable i , initialize it to 4 and then test the following increment and decrement statements. Comment on the obtained output.

Here is the incomplete code that I made:

    class Program
    {
        static void Main(string[] args)
        {
            int Cash;
            Cash = 10;

            Console.WriteLine("{0}", ++ Cash);
            Console.WriteLine("{0}", Cash);
            Console.WriteLine("{0}", Cash ++);
        }
    }

It gives me

11, 11 11

from the output. I'm not sure If I did it correct. Can someone please correct me if I'm wrong?

Answer 1

Yes, the output is correct:

// This line increments the variable then prints its value.
Console.WriteLine("{0}", ++ Cash);
// This prints the value of the (incremented variable)
Console.WriteLine("{0}", Cash);
// The prints the value of the variable *then* increments its value
Console.WriteLine("{0}", Cash ++);

Answer 2

Using var++ or ++var both increment your var value. If you use var++ on a writeline, system prints the value of the var before increment it.

If you want to decrement value from a var, use var--.

Answer 3

When you do ++Cash , it increments the variable first , then prints. After, you just print the variable, then on Cash++ it prints the variable before the increment. So yes your output is correct.

Answer 4

++cache= update variable and then take it


cache++ = take value and than update variable

Answer 5

int Cash;
Cash = 10;

Console.WriteLine("{0}", ++ Cash);
Console.WriteLine("{0}", Cash);
Console.WriteLine("{0}", Cash ++);

You initialize Cash to 10 (which should be lower case by the way). Then you preincrement before the WriteLine() is done. Thus it prints 11 . The next just prints out your cash variable which is at this point 11. Then you do a post increment see link... which prints out the cash variable and then increments it. If you writeLine() your cash variable now, it will be 12.

Answer 6

++ Cash is "Increase Cash by 1 and give it to me" - it will give you 11

Cash then is 11

Cash ++ is "Give me Cash and then increase it by 1" - it will give you 11 and then Cash will be 12.

Similar question: C# Pre- & Post Increment confusions

Answer 7

You will find alot of valuable information on the outputs you are obtaining here:

https://msdn.microsoft.com/en-us/library/36x43w8w.aspx

Short answer is that you are doing a pre increment and post increment operation there and thus are seeing the result AFTER the operation (in this case addition of one) - the value of the variable currently, and then the result BEFORE the operation. This is why you see 11 all three times.

cheers.