Programming Forums > Application Development > C++

Kilo · May 20th, 2006, 12:54 PM

How do i return the amount of elements within a string array!

script[i].Length() (shoudl work? haven't tried)

script.Length() (doesn't work)

any ideas?

jayme · May 20th, 2006, 1:13 PM

I don't understand why people post the question before they even try

..

Yes, script[i].Length(); works.

Cache · May 20th, 2006, 1:37 PM

(Toggle Plain Text)

sizeof(StringArray)/sizeof(StringArray[0]);

Although I would suggest using std::vector instead of an array:

(Toggle Plain Text)

std::vector<std::string> StringVector;
size_t size = StringVector.size();

Kilo · May 20th, 2006, 1:43 PM

maybe because thats no my question jayme... i know that it works!

i need to find out how many elemets are in the array no how many char's are in an element.

Thanks Cache!

New question

(Toggle Plain Text)

void Engine()
{
	// Error Initilizations
	i_curError = 0;
	s_errorArray[25] = 0x0;
}

i get undeclared identifier error for both lines

and why can't i return a damn string array!!! god damn't C# has corrupted my farkin mind!

(Toggle Plain Text)

/*std::string[] Engine::ReturnErrors()
{
	if(s_errorArray[0] != "")
		return s_errorArray;
	else
	{
		s_errorArray[0] = "none";
		return s_errorArray;
	}
}*/

lectricpharaoh · May 20th, 2006, 1:47 PM

Quote:

Originally Posted by jayme

I don't understand why people post the question before they even try

..

Yes, script.Length(); works.

Incorrect. Remember, C++ is case-sensitive. You can use either script.length() or script.size(), whichever you prefer.

[edit] Oh, you meant elements of the array, not elements of the string in the array. In that case, you can use sizeof(script)/sizeof(string), assuming that you allocated the space statically. If you are using dynamic allocation, you'll have to track it yourself, so if that is your intent, a vector is better, as Cache pointed out. [/edit]

Jimbo · May 20th, 2006, 4:10 PM

Quote:

Originally Posted by Kilo

i get undeclared identifier error for both lines

Probably because you didn't declare either of the variables you're assigning. Unless they're at the global scope, but you probably don't want that. As it is, your compiler doesn't know what type they are.

Quote:

Originally Posted by Kilo

and why can't i return a damn string array!!! god damn't C# has corrupted my farkin mind!

Again, declare your variables.

I would also recommend using a std::vector for your collection of strings, it's a lot easier to handle than dynamic arrays.

Kilo · May 20th, 2006, 4:21 PM

im familiar with vectors.. again im just attemping to port my code from C# to c++ as close as i can (hence the string array)

:banana:

Oh and i didn't declare all of my variables... thats insulting? i forgot to post the class declaration. I do program for a living you can give me a little more credit than that lol.

code is at work so i will write exactly what i have at work:

(Toggle Plain Text)

class Engine
{

public:

     Engine();
     ~Engine();

      int i_curError;
      std::string s_errorArray[25];

private:

      //code at work
}


void Engine()
{
	// Error Initilizations
	i_curError = 0;
	s_errorArray[25] = 0x0;
}

std::string[] Engine::ReturnErrors()
{
	if(s_errorArray[0] != "")
		return s_errorArray;
	else
	{
		s_errorArray[0] = "none";
		return s_errorArray;
	}
}

this bombs out for "undeclared identifier"... they are obviously declared...somehow the Constructor isn't being link to the class declaration.

EDIT

lectricpharaon: would this work ->
[php]
int len = sizeof(script)/sizeof(script[0]);
[/php]

Ooble · May 20th, 2006, 5:05 PM

Quote:

Originally Posted by Kilo

would this work ->
[php]
int len = sizeof(script)/sizeof(script[0]);
[/php]

As a std::string has a variable length, therefore it's unlikely to. What's wrong with the length method?

Jimbo · May 20th, 2006, 6:21 PM

Quote:

Originally Posted by Kilo

this bombs out for "undeclared identifier"... they are obviously declared...somehow the Constructor isn't being link to the class declaration.

If I'm reading the code correctly, you have your constructor defined as:

(Toggle Plain Text)

void Engine()
{
	// Error Initilizations
	i_curError = 0;
	s_errorArray[25] = 0x0;
}

This just declares a global function called Engine. The constructor should be

(Toggle Plain Text)

Engine::Engine()
{
   // stuff here
}

Because of the difference, you did have definition problems. I was wrong on the 2nd one though :o

nnxion · May 20th, 2006, 6:22 PM

Quote:

Originally Posted by Kilo

I do program for a living you can give me a little more credit than that lol.

We can't guess what you know or don't know, oh and please don't curse, C# is not the problem, PEBKAC.

May 20th, 2006, 12:54 PM	#1
Kilo Expert Programmer Join Date: Nov 2005 Location: In Pink Clam? Posts: 542 Rep Power: 0	String Array How do i return the amount of elements within a string array! script[i].Length() (shoudl work? haven't tried) script.Length() (doesn't work) any ideas? __________________ "When in Rome, Do as the Romans Do" "Beauty is in the eye of the BEER holder" "Save your breath your going to need it for your blow up doll later" SearchLores.org

May 20th, 2006, 1:37 PM	#3
Cache Hobbyist Join Date: Sep 2005 Posts: 266 Rep Power: 4	(Toggle Plain Text) sizeof(StringArray)/sizeof(StringArray[0]); sizeof(StringArray)/sizeof(StringArray[0]); Although I would suggest using std::vector instead of an array: (Toggle Plain Text) std::vector<std::string> StringVector; size_t size = StringVector.size(); std::vector<std::string> StringVector; size_t size = StringVector.size();

May 20th, 2006, 1:43 PM	#4
Kilo Expert Programmer Join Date: Nov 2005 Location: In Pink Clam? Posts: 542 Rep Power: 0	maybe because thats no my question jayme... i know that it works! i need to find out how many elemets are in the array no how many char's are in an element. Thanks Cache! New question (Toggle Plain Text) void Engine() { // Error Initilizations i_curError = 0; s_errorArray[25] = 0x0; } void Engine() { // Error Initilizations i_curError = 0; s_errorArray[25] = 0x0; } i get undeclared identifier error for both lines and why can't i return a damn string array!!! god damn't C# has corrupted my farkin mind! (Toggle Plain Text) /std::string[] Engine::ReturnErrors() { if(s_errorArray[0] != "") return s_errorArray; else { s_errorArray[0] = "none"; return s_errorArray; } }/ /std::string[] Engine::ReturnErrors() { if(s_errorArray[0] != "") return s_errorArray; else { s_errorArray[0] = "none"; return s_errorArray; } }/ __________________ "When in Rome, Do as the Romans Do" "Beauty is in the eye of the BEER holder" "Save your breath your going to need it for your blow up doll later" SearchLores.org

May 20th, 2006, 4:21 PM	#7
Kilo Expert Programmer Join Date: Nov 2005 Location: In Pink Clam? Posts: 542 Rep Power: 0	im familiar with vectors.. again im just attemping to port my code from C# to c++ as close as i can (hence the string array) :banana: Oh and i didn't declare all of my variables... thats insulting? i forgot to post the class declaration. I do program for a living you can give me a little more credit than that lol. code is at work so i will write exactly what i have at work: (Toggle Plain Text) class Engine { public: Engine(); ~Engine(); int i_curError; std::string s_errorArray[25]; private: //code at work } void Engine() { // Error Initilizations i_curError = 0; s_errorArray[25] = 0x0; } std::string[] Engine::ReturnErrors() { if(s_errorArray[0] != "") return s_errorArray; else { s_errorArray[0] = "none"; return s_errorArray; } } class Engine { public: Engine(); ~Engine(); int i_curError; std::string s_errorArray[25]; private: //code at work } void Engine() { // Error Initilizations i_curError = 0; s_errorArray[25] = 0x0; } std::string[] Engine::ReturnErrors() { if(s_errorArray[0] != "") return s_errorArray; else { s_errorArray[0] = "none"; return s_errorArray; } } this bombs out for "undeclared identifier"... they are obviously declared...somehow the Constructor isn't being link to the class declaration. EDITlectricpharaon: would this work -> [php] int len = sizeof(script)/sizeof(script[0]); [/php] __________________ "When in Rome, Do as the Romans Do" "Beauty is in the eye of the BEER holder" "Save your breath your going to need it for your blow up doll later" SearchLores.org

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Programming Forums > Application Development > C++

String Array