Adding zeros to a variable..

Question

I hav ea program that manipulates/works on six digit number entered by user.what i want is that if user enters less than 6 digits, program adds zeros at the end of number to make it 6 digit. like if user enters 241 program converts it into 241000 before manipulating it.which area i must look into? contecating or what?

Answer 1

Strings? Strings? We don' need no stinkin' Strings!
  while(x < 100000) x *= 10;this code works for all non-zero input that is actually 6 digits or less.
You didn't specify what you want to do for zero input, or negative input, or too long input. Here is some more robust code that works for all those cases, but you will need to check if it does what you want.
  int digitLimit = 1000000; // number of zeros here is number of digits.
  if(x<0){ // input was negative
    while(x <= -digitLimit){x /= 10;}
    x = -x; // done backwards to prevent failure on smallest possible negative number
  } else if (x = 0) { // input was zero
    x = 123456;
  } else if (x >= digitLimit) { // input was too big
    while(x >= digitLimit) {x /= 10;}  
  // this final pass deals with both small neg and small pos
  while(x < digitLimit/10){x *= 10;}