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Question: problem with for loop

Question:problem with for loop

mehdi jafari 749
August 06 2014
1

i want to define a loop for like this : 

for i from 0 to 100 by 0.2 do; ... ; od ;

i want when this loop finishes,the the loop turns to exactly vice versa respect,and continue , i mean it continue like this :
for i from 100 to 0 by -0.2 ...  , 

can anybody help me to find an algorithm for this ? tnx in advance
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