C#•2y ago

❔ The name number does not exist in the current context

I'm new at C#, and i had a problem with this code:

            for(int number = 1000; number < 0; number - 7)
            Console.WriteLine("{0} - 7 = ", number);

            for(int number = 1000; number < 0; number - 7)
            Console.WriteLine("{0} - 7 = ", number);

Error - The name "number" does not exist in the current context

16 Replies

Alexicon•2y ago

you have a semi colon at the end of your loop statement, you need to remove that. Also

number - 7

number - 7

doesnt work you need to do something like

number = number - 7

number = number - 7

inexQOP•2y ago

thank you, but now is other error: Only assignment, call, increment, decrement, and new object creation expressions can be used as an operator

Alexicon•2y ago

what does you code currently look like now?

inexQOP•2y ago

I edited my old code on top wait

Alexicon•2y ago

Right, like I mentioned in my previous message

number - 7

number - 7

doesn't work you need to do

number = number - 7

number = number - 7

number -= 7

number -= 7

inside the loop like this

for(int number = 1000; number < 0; number = number - 7)
{
    //...
}

for(int number = 1000; number < 0; number = number - 7)
{
    //...
}

inexQOP•2y ago

first variant doesn't working without any errors second variant is same maybe that:

            for(int number = 1000; number < 0; number - 7) {
              Console.WriteLine("{0} - 7 = ", number);
          {

            for(int number = 1000; number < 0; number - 7) {
              Console.WriteLine("{0} - 7 = ", number);
          {

? no, doesn't working without errors full code looks that:

using System;

namespace Program {

    class Program {

        static void Main() {
            for(int number = 1000; number < 0; number -= 7) {
            Console.WriteLine("{0} - 7 = ", number);
            }
        }
    }
}

using System;

namespace Program {

    class Program {

        static void Main() {
            for(int number = 1000; number < 0; number -= 7) {
            Console.WriteLine("{0} - 7 = ", number);
            }
        }
    }
}

Alexicon•2y ago

The problem now is just your logic. This loop wont do anything since your "number" starts a 1000 but your only looping when "number < 0" which can never be true. I think what your trying to do is something like:

for (int number = 1000; number > 0; number = number - 7)
{
    //...
}

for (int number = 1000; number > 0; number = number - 7)
{
    //...
}

inexQOP•2y ago

what i need to do now? int number = 1000; number < 0? I don't understand this

Alexicon•2y ago

Which part do you not understand? I do not quite follow what your question is now.

inexQOP•2y ago

I don't understand how does for() cycle working, what means those arguments: "number = 1000", "number > 0" I want to make a loop that subtracts 7 from 1000 until the result is less than zero

Alexicon•2y ago

Well I would reccomend reading about loops here if your new: https://learn.microsoft.com/en-us/dotnet/csharp/tour-of-csharp/tutorials/branches-and-loops-local specifically the section titled: Work with the for loop however breifly in my own words, A for loop has three components, the index variable, the condition to continue looping and the index modifier. in your example the index variable is

int number = 1000

int number = 1000

the condition to continue looping is

number < 0

number < 0

and the index modifier is

number = number - 7 //(number -= 7)

number = number - 7 //(number -= 7)

if your familiar with the way a while loop works you can think of this for loop in your mind like the following:

int number = 1000;
while (number < 0)
{
    //...

    number = number - 7;
}

int number = 1000;
while (number < 0)
{
    //...

    number = number - 7;
}

in this while loop example maybe you can see the issue, you are saying "while number is less than zero" keep looping, but because you start the number at 1000 it will never be less than zero at the start. thats why what I think you want is the opposite, "while number is greater than zero".

Branches and loops - Introduction to C# tutorial

In this tutorial about branches and loops, you write C# code to explore the language syntax that supports conditional branches and loops to execute statements repeatedly.

inexQOP•2y ago

Thank you so much

inexQOP•2y ago

it working, thanks

inexQOP•2y ago

@Alexicon number = number - 7 doesn't working, without errors my code:

            int counter = 1000;
                while (counter < 6)
                {
                Console.WriteLine($"The counter is {counter}");
                counter = counter - 7;
            }

            int counter = 1000;
                while (counter < 6)
                {
                Console.WriteLine($"The counter is {counter}");
                counter = counter - 7;
            }

on microsoft website writen only about ++ ahh it's --

Alexicon•2y ago

Yeah the "for iterator" can be basically any form of number modification on the variable. You don't have to only use ++ (+ 1) or -- (- 1) you can do anything like your original example (- 7). However ++ is probably the most common since often you will be working with arrays and or lists in loops where you want to access each item at an index.

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ The name number does not exist in the current context