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  1. #include <iostream>
  2.  
  3. template<int W>
  4. typename std::enable_if<(W<10), std::string>::type 
  5. to_number(int n){
  6. 	char const fmt [] = {'%', W+'0', 'd', 0};
  7. 	char buffer[20];
  8. 	sprintf(buffer, fmt, n);
  9. 	return buffer;
  10. }
  11. template<int W>
  12. typename std::enable_if<(W>=10), std::string>::type
  13. to_number(int n) {
  14. 	char const fmt [] = {'%', (W/10)+'0', (W%10)+'0', 'd', 0};
  15. 	char buffer[20];
  16. 	sprintf(buffer, fmt, n);
  17. 	return buffer;
  18. }
  19.  
  20. int main() {
  21. 	std::cout << to_number<5>(7) << '\n';
  22. 	std::cout << to_number<15>(7);
  23. 	return 0;
  24. }
Success #stdin #stdout 0.01s 5308KB
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stdin
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Standard input is empty
stdout
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    7
              7
https://ideone.com/87VZ7S
format number widths <10 and >=10
language:
C++14 (gcc 8.3)
created:
13 days ago
visibility:
public

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