does anyone have a java file that'll read in digits from another file and reverse the digits?
or any ideas on how i might go about doing that?

A LIFO, either simulated ( eg, using two arrays ) or real ( eg, a stack ). This sounds too much like a homework exercise to offer you more than a hint.

i dont think our class has covered what u just talked about. so it's not really a hint to me heh

If you read the digits from the file as strings, then you can use the StringBuffer class to reverse them. Check the Java API for info on StringBuffer.

can anyone help me with this... i'm currently doing this myself... (some code was given to me from the instructor to use in this program)
now, im stuck on the last loop, because the last loop makes num = null (because there is no more numbers), the program doesn't go on like it's supposed to. i've tried to make this into a pretested while loop, but i need to give a different value to "String oneLine = null", so it won't just exit right out of the loop. im not sure what value i can give to oneLine at the beginning for it to compile properly.

any ideas would be appriecated. thanks

String oneLine=null; /* the contents of a line of the user input file */
int numCount1=0;
do {
try {
oneLine = fileIn.readLine();
}
catch (IOException e) {
System.err.println("Sorry, unable to read a line from the file: " + filename);
System.exit(0);
}
int num = Integer.parseInt(oneLine); /* converts string to integer */
int revNum; /* holds the reversed digit */
int rightDigit=1; /* holds rightmost digit */
int numCount =-1; /* holds count of the while loop */
revNum = 0;
while (rightDigit !=0 ) {
rightDigit = num % 10;
revNum = revNum * 10 + rightDigit;
num = num / 10;
numCount = numCount + 1;
}
System.out.println("Read the line: " + oneLine);
System.out.println("Reversed is " + revNum / 10);
numCount1 = numCount1 + numCount;
System.out.println(numCount1);
} while (oneLine != null);

problem solved, program done )