A Line Never Processed

It took me two hours to find out a bug in my code. At this time, two hours could mean a real saboteur. It is not something classic, but still it's worth marking down.

So I wanted to read 1000 lines from a huge file at a time, and I did the following:

while (true)

{

count := 0;

while (infile>> xyz && count <1000)

{

        do something with xyz;

        count ++;

}

do something;

if (count < 1000)

      break;

}

}

The code runs smooth, however it takes a long time for me to find out some lines are missing from the output.

Eventually I found out it all occurs at 

while (infile>> xyz && count <1000)

which means if count == 1000 it will still read another line to xyz but stops at the condition count<1000, and that line will never be processed.

Looks silly, but it does caused me a lot of panic.