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  1. #include <iostream>
  2. #include <vector>
  3. #include <map>
  4. #include <string>
  5.  
  6. int foo_mult ( int x , int y )
  7. {
  8.    return x * y ;
  9. }
  10.  
  11. int foo_plus ( int x , int y )
  12. {
  13.    return x + y ;
  14. }
  15.  
  16. int foo_minus ( int x , int y )
  17. {
  18.    return x - y ;
  19. }
  20.  
  21.  
  22.  
  23. int main() 
  24. {
  25.    std::vector < int > vec ;
  26.    std::map < const char , int (*)(int,int) > oper ;
  27.    std::string str ;
  28.    std::getline ( std::cin , str ) ;
  29.    int num = 0 ;
  30.    while ( std::cin >> num ) {
  31.       vec.push_back ( num ) ;
  32.    }
  33.    for ( std::string::size_type i = 0 ; i < str.size() ; ++i ) {
  34.       int (*foo)(int,int) = 0 ;
  35.       switch ( str[i] )
  36.       {
  37.          case '-' : foo = foo_minus ; break ;
  38.          case '+' : foo = foo_plus ; break ;
  39.          case '*' : foo = foo_mult ; break ;
  40.       }
  41.       oper [ str[i] ] = foo ;
  42.    }
  43.    int result = vec[0] ;
  44.    for ( std::vector<int>::size_type i = 1 ; i < vec.size() ; ++i ) {
  45.       result = oper[str[i-1]](result,vec[i]) ;
  46.    }
  47.    std::cout << "Result = " << result << std::endl ;
  48. }
Success #stdin #stdout 0s 3480KB
comments (?)
stdin
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++-*+
10 4 6 8 3 14
stdout
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Result = 50
https://ideone.com/IZtG4r
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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