C++ 在文件名中插入 int 变量
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inserting int variable in file name
提问by Mithil Parekh
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 .
如何在创建 .vtk 文件时插入 int 变量？我想在每 k 步创建文件。即所以应该有一系列文件，从 file_no_1.vtk, file_no_2.vtk, ... 到 file_no_49.vtk 。
while(k<50){
ifstream myfile;
myfile.open("file_no_.vtk");
myfile.close();
k++;
}
回答by Rob?
In C++11:
在 C++11 中：
while(k<50){
ifstream myfile("file_no_" + std::to_string(k) + ".vtk");
// myfile << "data to write\n";
k++;
}
回答by Zeta
Use a stringstream(include <sstream>):
使用stringstream（包括<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++;
}
回答by wallyk
Like this:
像这样：
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):
或者，如果您不想要前导零（您的示例显示）：
snprintf (fn, sizeof fn, "file_no_%d.vtk", k);
