Overloading ambiguity: char and unsigned char : overloading ambiguity « Function « C++ Tutorial

1. C++ Tutorial
2. Function
3. overloading ambiguity

#include <iostream> 
using namespace std; 
 
char f(unsigned char ch); 
char f(char ch); 
 
int main() 
{ 
  cout << f('c');  // this calls f(char) 
  //cout << f(88) << " "; // Error, ambiguous! 
 
  return 0; 
} 
 
char f(unsigned char ch) 
{ 
  return ch-1; 
} 
 
char f(char ch) 
{ 
  return ch+1; 
}

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