Multiple while loop conditions

Question

Here is my sample code, made to work out how to get a while loop to end when any one of three conditions are satisfied.

I want the code to end when n = 100, but it ends at n = 301. How can I get this to end at n=100?

clear all; close all;
n = 0;
R = 0; A = 0; T = 0;    

while (R~=1) || (A~=1) || (T~=1)     
    if n == 100
        R = 1;
    end        
    if n == 200
        A = 1;
    end 
    if n == 300
        T = 1;
    end
    n=n+1;
end

Doesn't it feel like OR & AND are the wrong way around?

james.sw.clark
– james.sw.clark

2015-05-04 07:06:12 +00:00
Commented May 4, 2015 at 7:06 — james.sw.clark
– james.sw.clark, Commented May 4, 2015 at 7:06

cwissy · Accepted Answer · 2015-05-04 10:35:39Z

5

|| means or (with short circuiting). This means that your loop won't quit until all of the conditions are false.

You want to use AND, which is &&. This will mean the loop quits when at least one of the conditions is false.

ALSO (from the comments below):

Currently n will have a value of 101 when the loop finishes (because of the n=n+1 at the bottom of the loop). If it was important that the value of n was 100, then you could insert a break (info here) into the if body so that the loop quit when n = 100.

edited May 4, 2015 at 10:35

answered May 3, 2015 at 20:43

cwissy

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2 Comments

sobek Over a year ago

Also might be noteworthy that the loop counter will be at 101 when the abort condition is evaluated as true.

A. Donda Over a year ago

Seconding sobek: This is only a partial answer. Maybe suggest a break?

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