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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int f(const std::string &text) 
  5. {
  6.     if (text.size()>0 && std::isalpha(text[0]))
  7.        return std::toupper(text[0])-'A'; 
  8.     else return -1;    // or throw an exception 
  9. }
  10.  
  11. int main() {
  12. 	cout << "A->" << f("A")<<endl; 
  13. 	cout << "B->" << f("B")<<endl; 
  14. 	cout << "c->" << f("c")<<endl; 
  15. 	cout << "1->" << f("1")<<endl; 
  16. 	cout << "empty ->" << f("")<<endl; 
  17.  
  18.  
  19. 	return 0;
  20. }
Success #stdin #stdout 0s 4176KB
comments (?)
stdin
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Standard input is empty
stdout
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A->0
B->1
c->2
1->-1
empty ->-1
https://ideone.com/hzissG
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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