conditional statements and while loop

Hi,

I have the following while loop

while (dif1 > tol) &&  (dif2 > tol) && (dif3 > tol)

procedure 

end

I want all the conditions to be simultaneously satisfied. However, when I execute the code, the second condition dif2 > tol is not satisfied although the algorithm stops.

what I am doing wrong here ?

[Geoff Hayes]

If the second condition, dif2>tol is not satisfied then the while loop will stop because the code is "saying" do this procedure so long as dif1>tol AND dif2>tol AND dif3>top. So as soon as one of the three is not satisfied, then we stop executing the procedure. What are you expecting to happen instead of this?

[msh]

I see. Then this is not what I want. I need ALL conditions to be satisfied in the same time. That is, I need the loop to go on, until ALL three are false. How I should modify the conditions then?

[Star Strider]

The double operands ‘&&’ and ‘| |’ ‘short circuit’ the comparisons. See: Logical Operators: Short-Circuit && | |. If the first is false, it will not evaluate any of the others.

Answer 1

[Adam]

while (dif1 > tol) ||  (dif2 > tol) || (dif3 > tol)

should work if you want to carry on until all are false.

[msh]

yes, I already did it ! thanks