== vs =

• Don't forget, == is “equality”

• = is “assignment”

• A subtle mistake:

  • If ( a = 12 ) { do something } ;
  • Since a = 12 is an assignment, it always has the value 12. The value 12 is not 0 so it takes the true branch always!
  • Practice: equal.cpp in prata

• strcmp ( ) for c-string comparisons.