here is my code
using namespace std;
int main()
{
char ch;
cin>>ch;
do{
if(ch=='+')
{
long long int n1,n2,n3;
cin>>n1>>n2;
n3=n1+n2;
cout<<n3;
}
else if(ch=='-')
{
long long int n1,n2,n3;
cin>>n1>>n2;
n3=n1-n2;
cout<<n3;
}
else if(ch=='*')
{
long long int n1,n2,n3;
cin>>n1>>n2;
n3=n1*n2;
cout<<n3;
}
else if(ch=='/')
{
long long int n1,n2,n3;
cin>>n1>>n2;
if(n2==0)
{
break;}
else
{
n3=n1/n2 ;
cout<<n3;
}
}
else if(ch=='%')
{
long long int n1,n2,n3;
cin>>n1>>n2;
if(n2==0)
{
break;}
else
{
n3=n1%n2;
cout<<n3;
}
}
else
{
cout<<"Invalid operation. Try again.";
}
}while(ch!='x'||ch!='X') ;
return 0;
}