programming For loop until a specific value (C#)

[Shammikit]

this should be something simple but i havent managed to find anything about it on the internet. maybe i searched it wrong. idk, anyway this is what i have tried.

  

//i want to show value of i from 10 to 0. i have tried both methods below but nothing happens
 for (int i = 10; i == 0; i--)
 {
MessageBox.Show(i.ToString());
 }

 for (int i = 10; i.Equals(0); i--)
 {
MessageBox.Show(i.ToString());
 }


//normal loops like this work
 for (int i = 0; i < 10; i++)
 {
MessageBox.Show(i.ToString());
 }

 

[Pinguinsan]

for (int i = 10; i >= 0; i--) {
    MessageBox.Show(i.ToString());
}

The second item in a for loop represents the "conditional". The loop will execute as long as the conditional evaluates to true.

[Sauron]

the second value in the for loop is the condition for which it will continue to run. If you set i to 10 and then set the condition for the loop to be i == 0 it will never run. You need to use i >= 0, so it will go on until i is 0.

 

I'm not sure why you wrote the last loop correctly but tried to use equality checks in the other two.

[RhinoMcD]

I haven't really lived in the C# world all that much, but i'm gonna take a guess that your first two only print '0'

EDIT:  @Sauron clarified:

Quote

The first two will actually never even run because it sets i to 10, then checks if i is equal to 0, notices it is not (we just set it to 10), and does not enter the loop.

You're probably looking for this:

 for (int i = 10; i >= 0; i--)

which will take all values of i that are greater than or equal to 0

[Mira Yurizaki]

You seem to not understand how to make a loop work. In the case of a for-loop, the three fields are:

• Initial conditions
• A conditional that keeps the loop running as long as it's true
• Post loop action

The first two loops fail because the condition is not true at the start given the initial conditions. i = 10 will make i == 0 or some other expression to equate i to 0 false.

[Sauron]

Just now, RhinoMcD said:

I haven't really lived in the C# world all that much, but i'm gonna take a guess that your first two only print '0'

You're probably looking for this:

 for (int i = 10; i >= 0; i--)

which will take all values of i that are greater than or equal to 0

The first two will actually never even run because it sets i to 10, then checks if i is equal to 0, notices it is not (we just set it to 10), and does not enter the loop.

[Shammikit]

Thanks everyone.

3 minutes ago, Sauron said:

I'm not sure why you wrote the last loop correctly but tried to use equality checks in the other two.

silly mistake by me.thanks for pointing it out