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  1. #include <cstdlib>
  2. #include <string>
  3. #include <vector>
  4. #include <algorithm>
  5. #include <iostream>
  6. using namespace std;
  7.  
  8. void show(double a,double b,double c,char op) { cout<<a<<' '<<op<<' '<<b<<" = "<<c<<endl; }
  9.  
  10. typedef void fun(double a,double b);
  11. struct rec_t { const string cmd; fun *call; };
  12. /*
  13. rec_t tb[]=
  14. {
  15. 	{"+",[](double a,double b){ show(a,b,a+b,'+'); }},
  16. 	{"*",[](double a,double b){ show(a,b,a*b,'*'); }},
  17. 	{"stop",[](double a,double b){ cout<<"nara"<<endl; exit(0); }},
  18. 	{"",[](double a,double b){ cout<<"Nieznane polecenie"<<endl; }},
  19. };
  20. */
  21.  
  22. vector<rec_t> tb=
  23. {
  24. 	{
  25. 		{"+",[](double a,double b){ show(a,b,a+b,'+'); }},
  26. 		{"*",[](double a,double b){ show(a,b,a*b,'*'); }},
  27. 		{"stop",[](double a,double b){ cout<<"nara"<<endl; exit(0); }},
  28. 		{"",[](double a,double b){ cout<<"Nieznane polecenie"<<endl; }},
  29. 	}
  30. };
  31.  
  32. int main()
  33. {
  34. 	char op;
  35. 	string cmd;
  36. 	double a,b;
  37.     while(true)
  38.     {
  39.     	if(cin>>a>>op>>b) cmd=string(1,op);
  40.     	else
  41.     	{
  42.     		cin.clear();
  43.     		cin>>cmd;
  44.     	}
  45.     	find_if(begin(tb),end(tb),[&cmd](auto r){ return (!r.cmd.size())||(r.cmd==cmd); })->call(a,b);
  46. 		getline(cin,cmd);
  47.     }
  48. }
Success #stdin #stdout 0s 4404KB
comments (?)
stdin
copy 
1+2
2*3
4^7
5*5
3+5
stop
1+1
stdout
copy 
1 + 2 = 3
2 * 3 = 6
Nieznane polecenie
5 * 5 = 25
3 + 5 = 8
nara
https://ideone.com/IUuOeu
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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