c++ - derived class has same member variable name as base class -

#include<iostream> using namespace std;  class { protected:     int m_nvalue; public:     a(int nvalue):m_nvalue(nvalue)     {         cout << m_nvalue << endl;     } }; class b: public { public:     b(int nvalue): a(m_nvalue)     {         cout << m_nvalue << endl;     }     int getvalue()     {         return m_nvalue;     } }; int main() {     b b(4);     cout << b.getvalue() << endl;     return 0; } 

here, in above program not declaring m_nvalue again in derived class. in output, see junk values getting displayed rather displaying value "4". please explain this.

you're trying initialize m_nvalue m_nvalue itself. parameter nvalue (passed in value 4) not used @ all. that's why m_nvalue has garbage value.

you might want

b(int nvalue): a(nvalue) {     cout << m_nvalue << endl; }