#include<iostream.h>
int main()
{
int a=10;
a=a++;
cout<<a;
cout<<"\n";
a=++a;
cout<<a;
cout<<"\n";
a=(a++);
cout<<a;
cout<<"\n";
}

cc1plus: warnings being treated as errors
In function 'int main()':
Line 5: warning: operation on 'a' may be undefined
Line 8: warning: operation on 'a' may be undefined
Line 11: warning: operation on 'a' may be undefined