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.

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

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

it is in string.h

google strcat

Quote:

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Originally Posted by BeerGut

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

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

Quote:

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Originally Posted by BeerGut

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

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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.

I am using std::string and thanks for your help.
You have answered my questions.

Thanks again,
BeerGut

I have another question about strings.

If I have str1 which contains "123" how do I convert this to the int 123 and back again.
I have some dates in string format yyyymmdd which I wish to increment by days and months and years.

Thanks for reading,
BeerGut

Quote:

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Originally Posted by BeerGut

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

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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).

Quote:

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Originally Posted by BeerGut

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

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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.