Measuring string length

[Zaarin]

Am I just imagining something, or is there a strlen command? If there is how do I use it?

I want to be able to measure the length of a string.

[Nick]

yes you can use

#include <cstring>

using std::strlen;
for c style strings

or you can do something like

string s;
s.length();

[Dang]

I think you're going to need

using std::string;

for it to recognize string in the std namespace.

dan

[Zaarin]

I'm using visual c++ 6.0.

Can I please have a bit more of an explaination, or a small example?

Thankyou.

[Dang]

The following was created in Visual C++ as a Win32 console applicaiton. Selecting "Typical Hello world application" then modifying it.

#include "stdafx.h" //for precompiled headers
#include <iostream> //for cout and other c++ methods within iostream class
#include <string> //for string class

using namespace std; //use entire std namespace avoiding "std::" scope resolution operator

int main(int argc, char* argv[])
{

	string sData = "Test";
	cout << "sData contains " << sData << endl;
	cout << "sData's length is " << sData.length( ) << endl;
//or
	int nStringLength = sData.length( );
	cout << "sData contains " << sData << endl;
	cout << "sData's length is " << nStringLength << endl;

	return 0;

}

I hope this helps

[Unregistered]

hmm. I figured a method out the other day.

#include "iostream.h"
#include "stdio.h" // Used for gets()

int main()
{
char String[80];
cout << "Enter a string ";
gets(String);

int idx = 0;
while(String[idx] != NULL){ // you could replace NULL with 0
idx++;
}

cout << "You typed " << idx << " characters/spaces".
}

I'm not sure if this was the answer you were looking for.

[Nick]

Not Hungarian notation (:

Here is the c style one

#include <cstring>
using std::strlen;

#include <iostream>
using std::cout;
using std::endl;

int main(void)
{
     char* s = "Hello World!";
     int n = strlen(s);
     cout << "Hello World! is " << n << " charecters long" << endl;
     return 0;
}

[knave]

forgot to put my name up there.
In the Unregistered post.

[Nick]

gets is dangourous and shouldn't be used.
80 is a pretty good size buffer but someone still
could enter 81 charectors possibly causing a stack overflow.
Using fgets is safer.

[BubbleMan]

#include <iostream.h>
#include <string.h>

int main() {

char string[600];

cout << "Enter a string: ";
cin.getline(string,600);
cout << "Length: " << strlen(string);

return 0;
}

[Zaarin]

Thankyou for all the help so far, but I still have a problem.

I've been working with dangs code. His code works when it's written like it's shown above, but not when I modify the includes to how they are in my program.

Here are the files that I am including in my program(MS VC++ 6):

#include <iostream.h>
#include <string.h>
#include <stdlib.h>
#include <fstream.h>
#include <ctype.h>
#include <iomanip.h>

When they have the .h on the end dangs code doesn't work, but when i get rid of the .h, hundreds of other errors occur.

I'm not sure why this occurs as I was under the impression that you didn't really need the .h in VC++ anymore (though I have been told to use it - which is why I do). Any help or suggestions will be greatly appreciated, thanks again for all your help so far.

[Nick]

You arn't supposed to have .h after std includes
in c++. The reason why you having trouble
is that <string.h> and <string> are different files.

[Stoned_Coder]

change your includes from :-

#include <iostream.h>
#include <string.h>
#include <stdlib.h>
#include <fstream.h>
#include <ctype.h>
#include <iomanip.h>

to:-

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <cctype>
#include <iomanip>
// and add this line directly underneath the includes...
using namespace std;


also if you are using the STL string you will need to add <string> to that list of includes...

[Zaarin]

Thankyou very much - all complete (except for some stupid memory error, but that's not related to this issue).