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  1. #include <iostream>
  2.  
  3. int max_number(int value, int last_max = 0) {
  4.   if (!value || last_max == 9) return last_max;
  5.   last_max = std::max(last_max, value % 10);
  6.   return max_number(value / 10, last_max);
  7. }
  8.  
  9. int main() {
  10.   int value = 78421;
  11.   std::cout << "max number is: " << max_number(value);
  12. }
  13.  
Success #stdin #stdout 0s 3096KB
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Standard input is empty
stdout
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max number is: 8
https://ideone.com/O1EcBV
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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