The Standard Structure for a while Loop That Gets Input

• The standard structure for a while loop that gets input is:

get input
while (input ok)
{
    process
    ...
    get input
}

• If you are prompting the user using a sentinal loop, the input ok check would be while (input != sentinel).
• If you are reading from a datafile, the input ok check would be while (not at the end of the file).
• A while loop with this structure will always work, no matter what your program is doing.
• If you are having a problem with your input loop, re-write it to match this structure and it will most likely fix it.