How to stop the loop once store the 1st value of a variable?

Dear all, In my code, I need to break the code after recording the 1st value once the condition satisfied. However, when I executed the following code, the "Swt_Tm" variable keep updating for each iteration while the condition is satisfied.

                    if  strcmp (sg_12.get('AttValue','SigState'), 'GREEN')       
                        Swt_Tm= sim.get('AttValue', 'SimSec'); 
                    end

Answer 1

[Birdman]

Use break command inside the condition(note that break command works inside for and while loop):

for ...
   %%%code
       if  strcmp (sg_12.get('AttValue','SigState'), 'GREEN')       
           Swt_Tm= sim.get('AttValue', 'SimSec'); 
           break;
       end
   %%%code
end

[Sherif Shokry]

Thank you sir for your kind and quick answer. Although, I changed as the following code, the "Swt_Tm" variable keep changing for each iteration. Could you please advise me the needed correction.

while true
      if strcmp (sg_12.get('AttValue','SigState'), 'GREEN')       
         Swt_Tm= sim.get('AttValue', 'SimSec'); 
      end
          break
 end

[Birdman]

while true
      if strcmp (sg_12.get('AttValue','SigState'), 'GREEN')       
         Swt_Tm= sim.get('AttValue', 'SimSec'); 
         break;
      end
 end

This will break the loop once the if condition is entered.

[Sherif Shokry]

When I tried this modification, of course the loop was broken. I believe it's my fault that I did not explain it well. My idea that I need to record the 1st value once the condition is satisfied for each iteration by keeping the loop going on. For example, I need to record the time point (say 10:30:12) when a green signal starts. However, my code keep updating this value while the condition is satisfied (the green time still running) Thus, I need to keep just the first recorded time for this cycle and for the next phase, it should be also record the first recorded time for the next cycle (say 10:32:03) and so on.