C++ Conditional Operator

Simple note

The non-zero value or non-null pointer will be considered as true, zero and null will be considered as false.

Code

#include <iostream>
using namespace std;

/** All non-zero value/non-null pointer will be
 * considered as "true" in conditional operator
 */
class Base {
    public:
        int a;
        Base ()
        {
            a = 1;
        }
};
int main () {
    bool bbb = true;
    Base baseInst;
    Base* baseNull = NULL;
    cout << endl
        << "\t3 ? \t\t" << (3? "true" : "false") << endl // not zero, true
        << "\t-1 ? \t\t" << (-1? "true" : "false") << endl // not zero, true
        << "\t&baseInst ? \t" << (&baseInst? "true" : "false") << endl // pointer and not null, true
        << "\t\"test\" ? \t" << ("test"? "true" : "false") << endl
        << "\t0 ? \t\t" << (0? "true" : "false") << endl // zero, false
        << "\tbaseNull ? \t" << (baseNull? "true" : "false") << endl << endl; // null pointer, false

    system("PAUSE");
    return 0;
}

Result

Reference

http://www.cplusplus.com/forum/lounge/6307/

Download

File at github
https://github.com/benbai123/C_Cplusplus_Practice/blob/master/CPP/CPP_Basic/conditional_operator.cpp