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#include <cstdlib>
#include <iostream>
using namespace std;
 
void add() { cout<<"dodajemy"<<endl; }
void mul() { cout<<"mnożymy"<<endl; }
void stop() { exit(0); }
 
typedef void fun();
struct { const string cmd; fun *call; } tb[]=
{
	{"+",&add},
	{"*",&mul},
	{"stop",[]() -> { exit(0); }},
};
 
int main()
{
    for(string cmd;getline(cin,cmd);)
    {
    	bool found=false;
    	for(const auto &r:tb)
    	{
    		if(r.cmd==cmd)
    		{
    			r.call();
    			found=true;
    			break;
    		}
    	}
    	if(!found) cout<<"Nieznane polecenie"<<endl;
    }
}

prog.cpp:14:18: error: expected type-specifier before ‘{’ token
  {"stop",[]() -> { exit(0); }},
                  ^
prog.cpp:15:1: error: invalid user-defined conversion from ‘<lambda()>’ to ‘void (*)()’ [-fpermissive]
 };
 ^
prog.cpp:14:18: note: candidate is: ‘<lambda()>::operator int (*)()() const’ <near match>
  {"stop",[]() -> { exit(0); }},
                  ^
prog.cpp:14:18: note:   no known conversion from ‘int (*)()’ to ‘void (*)()’

Standard output is empty