Increasing the value of a for loop counter-Collection of common programming errors

• Variable, like in C

  In C, this loop leads to effectively making steps of 2, as obvious.

• Iterator, like in Python

  In Python, a loop like this gets fed by an iterator which constantly yields new values independent of the variable.

  for i in range(0, 100):
     print "A:", i
     i += 1
     print "B:", i
  

  leads to

  A: 0
  B: 1
  A: 1
  B: 2
  ....
  

  while your loop in C, provided with the correct outputs, would lead to

  A: 0
  B: 1
  A: 2
  B: 3
  ....
  

Originally posted 2013-11-09 22:48:24.