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  1. #include <iostream>
  2. #include <string>
  3.  
  4. int main()
  5. {
  6.     std::string s = "123";
  7.     s.insert(0, 12 - s.length(), '0');
  8.  
  9.     std::cout << s << std::endl;
  10.     return 0;
  11. }
Success #stdin #stdout 0s 4508KB
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stdin
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Standard input is empty
stdout
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000000000123
https://ideone.com/ZhG00V
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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