Possible Duplicate:
Easiest way to convert int to string in C++
How can I insert int variable while creating .vtk file? I want to create file at every k step. i.e. so there should be series of files, starting from file_no_1.vtk, file_no_2.vtk, ... to file_no_49.vtk .
while(k<50){
ifstream myfile;
myfile.open("file_no_.vtk");
myfile.close();
k++;
}
In C++11:
while(k<50){
ifstream myfile("file_no_" + std::to_string(k) + ".vtk");
// myfile << "data to write\n";
k++;
}
std::to_string? That's neat.
std::stoi, but depressed when I found out my implementation doesn't have either >.>
std::stoi and you commented on my post. :-/
Use a stringstream (include <sstream>):
while(k < 50){
std::ostringstream fileNameStream("file_no_");
fileNameStream << k << ".vtk";
std::string fileName = fileNameStream.str();
myfile.open(fileName.c_str());
// things
myfile.close();
k++;
}
myfile.open (fileName.str().c_str());, causing the confusion. Make sure not to do that, and instead make the string variable.Like this:
char fn [100];
snprintf (fn, sizeof fn, "file_no_%02d.vtk", k);
myfile.open(fn);
Or, if you don't want the leading zero (which your example shows):
snprintf (fn, sizeof fn, "file_no_%d.vtk", k);
MAGIC_BUFFER_SIZE? Hideously unsafe sprintf? You should be ashamed of yourself for posting this as a C++ answer.
snprintf in this way.
How to convert int to string?questions here. Just so you know, there's astd::to_stringfunction in C++11.