I have an if statement with the following condition:
And the contents of my strings are:Code:if ((strstr(to_units, param_units))&&(param_units!=NULL)) { ... stuff ... }
to_unit = "RADIANS"
param_units= "" //param_units is empty
"Stuff" is still getting executed even though param_units is empty. How do I make it so that the statement won't execute if param_units is empty?
Note that I check for non-empty param_units first, so that the more time consuming strstr() does not get executed if it doesn't have to. And I forgot what bizarre result strstr gives when looking for empty string. I'm sure it's not intuitive. So I'd rather not take that risk.Code:if (param_units[0] && strstr(to_units, param_units))
Last edited by nonoob; 07-09-2010 at 04:03 PM.
According to the C99 standard (7.21.5.7 p3) , strstr returns the first parameter if the second parameter points to a zero length string.
thanks nonoob! I used your code and it works perfectly.
