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  1. #include<iostream>
  2.  using namespace std;
  3.  
  4.  int main()
  5.  {
  6.      const double yen_to_euro=0.007215;
  7.      const double euro_to_dollar=1.12;
  8.      char currency='s';
  9.      double x;
  10.  
  11.      while(currency!='q')
  12.      {
  13.          cout << "enter currency and unit(y , e, or d)";
  14.  
  15.          while ( (cin >> x >> currency).fail() && !cin.eof()) {
  16.              cout << "invalid format";
  17.              cin.clear(); 
  18.          }
  19.          if (cin.eof())
  20.              break; 
  21.  
  22.          switch(currency){
  23.  
  24.              case 'y':
  25.                  cout <<"euro:"<< x*yen_to_euro<<" dollar:"<<x*yen_to_euro*euro_to_dollar<<'\n';
  26.                  break;
  27.              case 'e':
  28.                  cout <<"yen:"<< (x*(1.0/yen_to_euro))<<" dollar:"<<(x*euro_to_dollar)<<'\n';
  29.                  break;
  30.              case 'd':
  31.                  cout <<" yen:"<< x*(1.0/yen_to_euro)*(1.0/euro_to_dollar)<<" euro:"<<x*(1.0/euro_to_dollar)<<'\n';
  32.                  break;
  33.              case 'q':
  34.                  currency='q';
  35.                  break;
  36.              default:
  37.                  cout << "invalid";
  38.                  break;
  39.  
  40.          }
  41.  
  42.      }
  43.  
  44.  
  45.  }
Success #stdin #stdout 0s 3460KB
comments (?)
stdin 
12 e
12e
12 y
stdout 
enter currency and unit(y , e, or d)yen:1663.2 dollar:13.44
enter currency and unit(y , e, or d)invalid formateuro:0.08658 dollar:0.0969696
enter currency and unit(y , e, or d)
https://ideone.com/otH8st
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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