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  1.  
  2. #include <string>
  3. #include <iostream>
  4.  
  5. int main()
  6. {
  7.     int a = 5;
  8.     std::string filename = "file" + std::to_string(a) + ".txt";
  9.  
  10.     std::cout << "The filename is: " << filename << std::endl;
  11.  
  12.     // if you need a const char*:
  13.     const char* ptr = filename.c_str();
  14.     std::cout << "As a pointer:  " << ptr << std::endl;
  15. }
  16.  
Success #stdin #stdout 0s 3272KB
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stdin
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Standard input is empty
stdout
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The filename is: file5.txt
As a pointer:  file5.txt
https://ideone.com/SDc4gt
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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