counting number of times commadn executed in while loop

Hello,

I am working on a problem where I need to know how many years it would take for interest being compounded annually to be twice the intial investment. for Initial investment of $1000, here is my code at a rate of 5%

FinalValue = Investment;
while FinalValue < 2*Investment; 
    FinalValue = FinalValue + Rate*FinalValue;
end

but I dont know how to assign numYears to the number of years (number of executions) of this loop.

Answer 1

[Roger Stafford]

   FinalValue = Investment;
   Count = 0;
   while FinalValue < 2*Investment; 
      FinalValue = FinalValue + Rate*FinalValue;
      Count = Count+1;
   end

[Rick]

could you explain how that works? What is Count+1??

[Roger Stafford]

'Count' is a count of the number of times you have executed the line

   FinalValue = FinalValue + Rate*FinalValue;

which is presumably the number of years you have accumulated interest in doubling your initial investment. It increases by one for each trip through the while-loop.