#include <iostream>
using namespace std;

void calc(){
    int a,b;
    char op;
    cout<<"Ââåäèòå ïåðåìåííóþ, îïåðàöèþ, ïåðåìåííóþ"<<endl;
    cout<<"Ê ïðèìåðó: 5+5"<<endl;
    cin>>a>>op>>b;
    if(b==0 && op=='/'){
        cout<<"Íà 0 íåëüçÿ äåëèòü"<<endl;
          return 0;
    }
    }
    switch(op){
        case '+':cout<<a+b<<endl;break;
        case '-':cout<<a-b<<endl;break;
        case '/':cout<<a/b<<endl;break;
        case '*':cout<<a*b<<endl;break;
    }
void conv(){
    double RUB,EUR,USD,kz,val;
    cout<<"Ââåäèòå ñóììó â òåíãå è â êàêóþ âàëþòó êîíâåðòèðîâàòü:"<<endl;
    cout<<"RUB,EUR,USD"<<endl;
    cin>>kz>>val;
    switch(val){
        case 'RUB':cout<<kz*0.18<<endl;break;
        case 'EUR':cout<<kz*0.0028<<endl;break;
        case 'USD':cout<<kz*0.003<<endl;break;
    }

}
    int main(){
        setlocale(LC_ALL,"0");
    }