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  1. #include <iostream>
  2. #include <sstream>
  3. #include <iomanip>
  4.  
  5. int main()
  6. {
  7.     int num = 1;
  8.     std::ostringstream ss;
  9.     ss << std::setfill('0') << std::setw(3) << num;
  10.     std::string filename = ss.str() + ".txt";
  11.     std::cout << filename << std::endl;
  12. }
Success #stdin #stdout 0s 2984KB
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stdin
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Standard input is empty
stdout
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001.txt
https://ideone.com/1sLjLf
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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