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Stacks

Posted on 2003-10-31
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please explain to me how this for statement works:

assuming that stack is a class with stack type set to int and stack capacity to 5.  Give the content of myTop and myArray data memebers of s after code segment has been executed.

Stack s;
for (int i = 0; i<5; i++)  //please help me in this step, what is the first value of i
s.push(2*i);    //what are the values of all the i's please help me.
   s.pop();
   s.pop();

the answer according to my professor is myTop = 2 and myArray is 0, 2, 4, 6 but please help me understand why it is so. i had this question on an exam and i need to understand it.  
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Question by:needle176
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lwinkenb earned 80 total points
ID: 9662062
If you were going to put that for loop into english, it would sound like:
set an integer 'i' equal to 0.  while 'i' is less than 5 run the corresponding body, and add 1 to 'i' after each iteration through the loop.

So basically the for loop in your example runs 5 times.  The first time i is equal to 0, then 1, then 2, until it reaches 4.  When i is equal to 5 it wont run because the condition in the for loop says to run while i<5.

since you are pushing 2*i onto the stack, you will basically push the values 0, 2, 4, 6, 8.  Then the last two commands will pop 8, and 6 from the stack.
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