Weird error message

Well its me again.

I am trying to grasp the concept of reading and writing to files and was a bit confused on what the book was doing. So I decided to copy the example to see what was happening and I cant get the code to run. This is straight from the book and I get this error

fatal error C1083: Cannot open include file: 'stdlib': No such file or directory

ok so I changed it to <cstdlib> and I get the "error C2065: 'nocreate' : undeclared identifier"

Is the book out dated?

Code:

---

#include <iostream>
#include <fstream>
#include <iomanip>
#include <stdlib>   

using namespace std;

int main()
{
        const int MAXLENGTH = 21; //maximum file name length
        const int MAXCHARS = 80; //maximum line length
        char file1[MAXLENGTH] = "input.txt";
        char line[MAXCHARS];
        int ch;
        ifstream inFile;  //ifstream constructor opens the file

        inFile.open (file1, ios::nocreate);

        if (inFile.fail()) //checks for a successful open
                {
                        cout << "\nThe file was not successfully opened"
                                << "\n Please check that the file currently exists."
                                << endl;
                        exit (1);
                }

        cout << endl;

        while( (ch = inFile.peek()) != EOF )
                {
                        inFile.getline(line, MAXCHARS, '\n');
                        cout << line << endl;
                }
               
        inFile.close();
        cout << endl;

        return 0;

}

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To my knowledge, <stdlib> is NOT a standard C++ header. <cstdlib> is, but its part of the C library and not relevant for the example code you posted.

I would just remove the #include.

Quote:

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<cstdlib> is, but its part of the C library and not relevant for the example code you posted.

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std::exit is used though, so <cstdlib> is relevant.

you could change:

Code:

---

inFile.open (file1, ios::nocreate);

---

to:

Code:

---

inFile.open( file1.c_str() );

---

I think at least, I'm not sure if that helps. I just finished learning about I/O to files myself.

No, file1 is a char[MAXLENGTH], not a std::string. But yes, the ios::nocreate thing should probably just be removed.