C++ :

#include<bits/stdc++.h>
using namespace std;
char s,s1,fh;
int a,b;
int main()
{
	cin>>s;
	if(s=='-') {cin>>s1;a=-(int(s1)-48);}
	else a=int(s)-48;
	cin>>fh>>s;
	if(s=='-') {cin>>s1;b=-(int(s1)-48);}
	else b=int(s)-48;
	if(fh=='+') cout<<a+b;
	if(fh=='-') cout<<a-b;	
	if(fh=='*') cout<<a*b;
	if(fh=='/') 
		if(b==0) cout<<"NO";
		else cout<<a/b;

	return 0;
}