#setprecision rounding eror

#include<bits/stdc++.h>
#define s std::

 int main()
{
    //rounding error
    s cout<< s setprecision(17);
    double a(1.0);
    double b(.1+.1+.1+.1+.1+.1+.1+.1+.1+.1);
    double c(.1*10);
    s cout<<a<<s endl;
    s cout<<b<<s endl;
    s cout<<c<<s endl;
}

 output:
1
0.99999999999999989
1

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C++ Class

ছবি
> Abstraction >E ncapsulation   /Access Modifiers >Inheritance #include <iostream> using namespace std; class vehicle { public:     vehicle()     {         cout<<"this is a constructor of vehicle"<<endl;     }     ~vehicle()     {         cout<<"this is a deconstructor of vehicle"<<endl;     } }; class fourwheeler { public:     fourwheeler()     {         cout<<"this is the constructor of fourwheeler"<<endl;     }     fourwheeler(string x)     {         cout<<"This is another constructor which has "<<x<<" with it"<<endl;     }     ~fourwheeler()     {         cout<<"this is deconstructor of fourwheeler"<<endl;   ...
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