Variable filename

When I do something like ofstream newfile("file.txt"); in order to create a new file, how can I use a user-input variable as the filename and add .txt to it in order to make a custom-named file?

Code:

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string input;
getinput(input); // you implement
input += ".txt";
ofstream file(input.c_str());

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is one way to do it

Thanks, I think that will work... but another part of my code is being screwy... when I enter something for the cin, it executes the if fine, but then it skips the next cin ... I know it's because it's reading the '\n' character, but I don't know how to stop it... any suggestions?

Here's the code for better understanding:

Code:

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void main() {
        char name[20];

        char choice;

        cout << "Load file (L) or create New file (N)?";
        cin >> choice;
        if (tolower(choice) == 'l') {

                //Does stuff...

        }else{

        cout << "Please enter your name(no more than 20 letters): ";
        cin.getline(name, 20, '\n');                        //It skips this line (or rather, it enters '\n')

}

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one way is to place a call to ignore() before every call to getline(). Depending on how persnickity you want to be you can do something simple like this:

cin >> choice;
cin.ignore();
getline(cin, string1);

which will ignore just one char, or somewhat more sure would be something like this:

cin >> choice;
cin.ignore(1000);
getline(cin, string1);

which will ignore up to 1000 char or until a newline char is found, whichever comes first. The most robust way is to use the largest size int possible, which is available from the limits.h or climits file and is called something like INT_MAX. It would look something like this:

#include <climit>
//do dah
cin >> choice;
cin.ignore(INT_MAX, string1);
getline(cin, string1);

>>The most robust way is to use the largest size int possible
You need the max. possible stream size.

Code:

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    cin.ignore(numeric_limits<std::streamsize>::max(), '\n');

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Thanks, that worked! I have another question ... is there a way to do a tolower() effect on a string?

I believe most string classes have a tolower() function that would be used somehting like this:

string s = "Hello";
s.tolower();
cout << s;

It might be called Tolower() or tolower() or toLower() or whatever, so look at your documentation. the version of tolower() in sting.h (aka cstring) is for single char only, not full C style strings.

For std::string you can do you something like this

Code:

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#include <iostream>
#include <string>
#include <algorithm>
#include <functional>

using namespace std;

int main()
{
  string str = "Hello World";

  transform(str.begin(),str.end(),str.begin(),ptr_fun(::toupper));

  cout << str << endl;
}

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