Strings - functions

I have declared the following function prototypes in "functions.h". Here is the contents of the file:

Code:

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#ifndef FUNCTIONS_H
#define FUNCTIONS_H
#include <string>

int open_source_file(string);
int display_source_file(string);
int display_story_file(string);
void menu();

#endif

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I get an error when I try to compile this which says that string is an undeclared identifier.
Maybe I am doing something wrong, but whar I mean by the first 3 function prototypes is that they all take a string as an argument.

Thanks

Prefix all occurances of string with std::.

Code:

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#ifndef FUNCTIONS_H
#define FUNCTIONS_H
#include <string>

int open_source_file(std::string);
int display_source_file(std::string);
int display_story_file(std::string);
void menu();

#endif

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-Prelude

Thanks, it works fine now, but I am getting a weird error with the actual function, like this one:

Code:

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int display_source_file(std::string fileName)
{
        ifstream file(fileName);
        string current_line;
       
        // read one line at a time from the file
        // and print it
        while(getline(file, current_line))
        {
                cout << current_line << endl;
        }
}

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The error I am getting is:
error C2664: '__thiscall std::basic_ifstream<char,struct std::char_traits<char> >::std::basic_ifstream<char,struct std::char_traits<char> >(const char *,int)' : cannot convert parameter 1 from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' to 'const char *'

Thanks

The ifstream constructor takes a const char*, not a string. Use the strings c_str member to pass to the ifstream constructor.

Code:

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ifstream file(fileName.c_str());

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As with string, you must prefix cout and endl with std:: if you have not included the namespace std.

Code:

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  std::cout << current_line << std::endl;

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