C++ Mastermind For Loop - c++

Question

Edit
I've included #include <sstream> now. This helped. But still an issue displaying the correct information. I've stepped it out, and it has to deal with some sort of program error. I have the text file already made inside of the same folder path. I've tried setting it to a direct C:/ path such as
C:\Users\Matt\Documents\Visual Studio 2015\Projects\listofcolors.txt
I'm having problem opening my file and displaying data. I recently downloaded Microsoft Visual Basic C++ to write the program I need for Mastermind. My goal is to create numbers that represent 9 to the 5th and put them within a text file. (Essentially, 5 columns of 9 numbers, 9 I've written this so far.
#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
int main() {
int a = 0;
int b = 0;
int c = 0;
int d = 0;
int e = 0;
std::string result;
std::stringstream sstm;
ofstream myfile;
myfile.open("listofcolors.txt");
if (myfile.is_open())
{
for (a = 0; a<9; a++) {
sstm << a << b << c << d << e;
result = sstm.str();
myfile << result << '\n';
for (b = 0; b<9; b++) {
sstm << a << b << c << d << e;
result = sstm.str();
myfile << result << '\n';
for (c = 0; c<9; c++) {
sstm << a << b << c << d << e;
result = sstm.str();
myfile << result << '\n';
for (d = 0; d<9; d++) {
sstm << a << b << c << d << e;
result = sstm.str();
myfile << result << '\n';
for (e = 0; e<9; e++) {
sstm << a << b << c << d << e;
result = sstm.str();
myfile << result << '\n';
}
}
}
}
myfile.close();
return 0;
}
}
else cout << "Unable to open file";
return 0;
}
For some reason, nothing is outputted. Any ideas??? Thank you!!

Answer 1

We can get clever by borrowing this arbitrary base conversion code that will output numbers in base 9 - see the cout version online here:
#include <iostream>
#include <iomanip>
#include <fstream>
#include <algorithm>
using namespace std;
/**
* C++ version 0.4 std::string style "itoa":
* Contributions from Stuart Lowe, Ray-Yuan Sheu,
* Rodrigo de Salvo Braz, Luc Gallant, John Maloney
* and Brian Hunt
*/
std::string itoa(int value, int base) {
std::string buf;
// check that the base if valid
if (base < 2 || base > 16) return buf;
enum { kMaxDigits = 35 };
buf.reserve( kMaxDigits ); // Pre-allocate enough space.
int quotient = value;
// Translating number to string with base:
do {
buf += "0123456789abcdef"[ std::abs( quotient % base ) ];
quotient /= base;
} while ( quotient );
// Append the negative sign
if ( value < 0) buf += '-';
std::reverse( buf.begin(), buf.end() );
return buf;
}
int main() {
ofstream myfile("listofcolors.text");
if (myfile.is_open())
{
for (int i = 0; i <= 9 * 9 * 9 * 9 * 9; i++)
{
// Formats the number to five places, filled with leading zeroes
myfile << setw(5) << setfill('0') << itoa(i, 9) << '\n';
}
myfile.close();
}
else
cout << "Unable to open file";
return 0;
}
Note that the file is created in the working directory; here is how to check and set where it is.
Also note that your code had the myfile.close() inside the first loop, so it would only have printed from 00000 to 08888.
Finally, since you are on Windows, use File Explorer to search for listofcolors.txt, just in case it is being created in an unexpected location.

Answer 2

On Windows, text files have a .txt file extension, not .text. Also, you are creating the file using a relative path, so it will be created in the process's current working directory, which may not be what you are expecting it to be. Always use absolute paths.
Your loop code is unnecessarily complex, it can be simplified to something more like this:
#include <iostream>
#include <fstream>
using namespace std;
int main() {
ofstream myfile("C:\\some path\\listofcolors.txt", ios_base::trunc);
if (myfile.is_open())
{
for (int a = 0; a < 9; a++)
for (int b = 0; b < 9; b++)
for (int c = 0; c < 9; c++)
for (int d = 0; d < 9; d++)
for (int e = 0; e < 9; e++) {
if (!(myfile << a << b << c << d << e << '\n')) {
cout << "Unable to write to file";
return 0;
}
}
myfile.close();
cout << "File created";
}
else
cout << "Unable to create file";
return 0;
}