[C++] howto put a stringline in a string var

[Jelte]

Hello people,

First I would like to say that I am Dutch. so if my English Grammar is terrible or you dont understand me please say it.

I am working on teach myself basics of C++ with the beginners tutorials from Cprogramming.

I try to make a program that stores a string value and return the length of it. I succeeded this by handle strings, what is called "c-style"(using cstring header). but now I want to do it "C++ style" (using string header)because I think it is not necessary to declare a maximum to each string variable in this program.

I made this code:

#include <iostream> 				// for cout.
#include <string>					// for string functions.

using namespace std;

int main()
{
position.
string        plaintext;  				// will be stored in here.		
int 	        plntxtlenght;				// the lenght of the plaintext-string will be stored here.
	
		plaintext = "abcdefghijklmnopqestuvwxyz";
	
	
	plntxtlenght = plainchars.lenght ;			// reads the string of plaintext and store the length of characters in plntxtlenght.
	cout<<plntxtlenght <<endl;		// print the value of plntxtlenght in the screen.
	cin.get();						// waits for keypress event to exit.
}

but my compiler(g++) return this error:

stringlenght.cpp: In function ‘int main()’:
stringlenght.cpp:17: fout: no matching function for call to ‘std::basic_istream<char, std::char_traits<char> >::getline(std::string&)’
/usr/include/c++/4.3/istream:598: note: kandidaten zijn: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::getline(_CharT*, std::streamsize, _CharT) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:409: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::getline(_CharT*, std::streamsize) [with _CharT = char, _Traits = std::char_traits<char>]
stringlenght.cpp:19: fout: ‘struct std::string’ has no member named ‘lenght’
jelte@jelte-desktop:/media/DATA/Jelte/Programming/C++/Projecten/Ceasar-rotatie/oefeningen/stringlenght$
jelte@jelte-desktop:/media/DATA/Jelte/Programming/C++/Projecten/Ceasar-rotatie/oefeningen/stringlenght$ g++ stringlenght.cpp -o stringlenght
stringlenght.cpp: In function ‘int main()’:
stringlenght.cpp:17: fout: no matching function for call to ‘std::basic_istream<char, std::char_traits<char> >::getline(std::string&)’
/usr/include/c++/4.3/istream:598: note: kandidaten zijn: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::getline(_CharT*, std::streamsize, _CharT) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:409: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::getline(_CharT*, std::streamsize) [with _CharT = char, _Traits = std::char_traits<char>]
stringlenght.cpp:19: fout: argument of type ‘size_t (std::basic_string<char, std::char_traits<char>, std::allocator<char> >:()const’ does not match ‘int’

I cant see what I am doing wrong?

Thanks in advance

Jelte,

[laserlight]

Well, you have a stray word in your source code ("position."), and it looks like the plntxtlenght variable is unnecessary, and the plainchars variable does not exist.

Perhaps you could use this as a starting point:

#include <iostream>
#include <string>

using namespace std;

int main()
{
    string plaintext = "abcdefghijklmnopqestuvwxyz";

    cout << plaintext.length() << endl;

    cin.get(); // waits for keypress event to exit.
}

If you want to read the text from a line from the user, consider using the version of std::getline() for std::string, e.g.,

getline(cin, plaintext);

[SevenThunders]

stringlenght.cpp:19: fout: ‘struct std::string’ has no member named ‘lenght’

You also spelled length wrong. It looks like a typo.

[matsp]

plntxtlenght

It may not seem to matter (and it certainly doesn't to the compiler), but spelling variables right is very useful to make sure that others can modify/add to your existing code.

Length ends with th, not ht.

--
Mats

[Jelte]

mmhzz indeed i did a lot of typos :S sorry about that. All of your comment are very usefull i think, Thanks . now I´m gonna sleep (at this moment it is midnight in Holland :P)

I will report if i make some progress

Bye

Jelte