int get(int a1,int a2,int o){
switch(o){
case 0:
a1+=a2;
break;
case 1:
a1-=a2;
break;
case 2:
a1*=a2;
break;
case 3:
(a2==0) ?(0) :(a1/=a2);
break;
}return a1;}
char* getO(int n){
switch(n){
case 0:
return "+";
case 1:
return "-";
case 2:
return "*";
case 3:
return "/";
}}