Thread: String handling for a newbie

I have two questions about strings.

1: How do I compare two strings within an if statement?

2: How do I glue two strings together to make one longer string?

I know these are simple issues but I haven't found answers in online tutorials.

Thanks,

BeerGut


ps: I'm using C++ strings.

Originally Posted by BeerGut

1: How do I compare two strings within an if statement?

You can compare them using the usual comparison operators, e.g., str1 == str2.

Originally Posted by BeerGut

2: How do I glue two strings together to make one longer string?

Use the overloaded operator+ to concatenate, e.g., str1 + str2.

EDIT:
Refer to the website linked to in my signature for a reference.

Of course laserlight assumes you're using std::string for string variables, which you should definitely do. RockyMarrone assumes you're using C-style strings (char arrays), which you should not do.

Originally Posted by BeerGut

If I have str1 which contains "123" how do I convert this to the int 123 and back again.

Read up on how to use a stringstream. If you happen to have access to the Boost libraries, you could use boost::lexical_cast instead (its implementation uses a stringstream).

Originally Posted by BeerGut

I have some dates in string format yyyymmdd which I wish to increment by days and months and years.

Again, if you have access to Boost you could use Boost.Date_Time. If you do not have access to any such date handling library, then you have to implement this yourself.