While Loops C#

[RockyRZ]

How do I break a While loop in C# when I enter a negative integer?

 

[minibois]

1 minute ago, RockyRZ said:

How do I break a While loop in C# when I enter a negative integer?

if(number < 0)
{
	break;
}

 

Of course without having any more information, there could be a million other ways of handling this, but this is the simplest way to directly answer your question,

[RockyRZ]

9 minutes ago, minibois said:

if(number < 0)
{
	break;
}

 

Of course without having any more information, there could be a million other ways of handling this, but this is the simplest way to directly answer your question,

So I’m supposed to break the loop when a negative number is inputted then give out the result of all inputted numbers.

 

<int value = 0;
        int total = 0;
        
        int x = 1;
        while ( x <= 1){
        Console.Write("Input a number: ");
        value = Int32.Parse(Console.ReadLine());
        total = value + total;
        }
        
        Console.WriteLine($"{total}");>

[trag1c]

So at every iteration a while loop evaluates some condition. So in the the parenthesis of your while loop you have to put the logic for that condition. So if you did

// Here is where you set your conditions for the loop to be executed. 
while(number >= 0)
{
	// Run some code
    foo();
}

// you can also check if multiple conditions using boolean logic.
// so if you wanted to run the loop while say 2 (or more you can do as many conditions as you like) variables are between 2 values you could do this

// always initialize something to a variable but this is just pseudo code so...
int number;
bool keepGoing = true;

while(number >= 0 && keepGoing)
{
	// run some code
    foo();
    if(bar)
    {
    	keepGoing false;
    }
}

// you can also check if either condition is true and run the while loop as well with || and many others

 

[minibois]

1 minute ago, RockyRZ said:

So I’m supposed to break the loop when a negative number is inputted then give out the result of all inputted numbers.

 

<int value = 0;
        int total = 0;
        
        int x = 1;
        while ( x <= 1){
        Console.Write("Input a number: ");
        value = Int32.Parse(Console.ReadLine());
        total = value + total;
        }
        
        Console.WriteLine($"{total}");>

You can make the condition in the while trigger what you want to do.

int input = 0;        
int total = 0;

while(input => 0)
{
        Console.Write("Input a number: ");
        input = Int32.Parse(Console.ReadLine());
        total += input;
}

Console.WriteLine("Total is: " + total);

The while 'tests' if the 'input' variable is 0 or higher. If it's lower than 0 (a negative number), the while will stop and the "total is" line will be written.

If the inputted number is 0 or above (a positive number) it will count up.

 

This code is missing some sanitization on the input, as if you input anything that is not a number (i.e. a letter, or symbol), the code will not break under the Int32.Parse.

For a proper program, you want to test the input using Int32.TryParse (which tells you if the input is a number or not) and only then once confirmed a number, you want to actually convert the input to an int.

But if you want/need to implement that depends on if that is needed in the homework assignment.

[RockyRZ]

1 hour ago, minibois said:

You can make the condition in the while trigger what you want to do.

int input = 0;        
int total = 0;

while(input => 0)
{
        Console.Write("Input a number: ");
        input = Int32.Parse(Console.ReadLine());
        total += input;
}

Console.WriteLine("Total is: " + total);

The while 'tests' if the 'input' variable is 0 or higher. If it's lower than 0 (a negative number), the while will stop and the "total is" line will be written.

If the inputted number is 0 or above (a positive number) it will count up.

 

This code is missing some sanitization on the input, as if you input anything that is not a number (i.e. a letter, or symbol), the code will not break under the Int32.Parse.

For a proper program, you want to test the input using Int32.TryParse (which tells you if the input is a number or not) and only then once confirmed a number, you want to actually convert the input to an int.

But if you want/need to implement that depends on if that is needed in the homework assignment.

 

“A local variable named `input' cannot be declared in this scope because it would give a different meaning to `input', which is already used in a `parent or current' scope to denote something else
Compilation failed: 1 error(s), 0 warnings”

 

It seems this method didn’t work.
 

[RockyRZ]

56 minutes ago, Sakuriru said:

This code has two bugs.

1. The greater than or equal to symbol is ">=" and not "=>".
2. When input is less than zero it will include it in the total calculation.

Yeah I was able to find a way around that with:

 

      

        int input = 0;
        int total = 0;
        
        int x = 1;
        while (x > 0) {
        Console.Write("Input a number: ");
        input = Int32.Parse(Console.ReadLine());
        if (input < -1)
        break;
        total += input;
        }
        
        Console.WriteLine("\nSum total is" + total); 

 

[minibois]

8 hours ago, Sakuriru said:

This code has two bugs.

1. The greater than or equal to symbol is ">=" and not "=>".
2. When input is less than zero it will include it in the total calculation.

If I told you I included those errors on purpose, so OP still had to debug some code, would that be believable?
No? Okay..

/s

 

Thanks for the corrections, I just kinda typed that code on the spot and it's clear I rely a bit on Visual Studio showing me a red line when doing stuff like "=>", lol.

[wanderingfool2]

On 11/12/2020 at 7:05 PM, Sakuriru said:

"int x = 1" and "while (x > 0)" can be reduced to simply "while (true)", since x will never be set to another value.

This is the only advise I would change, while it's true it overlooks the bigger improvement of using a do while loop.  (and just testing for input < 0)