Chapter. Sams Publishing Object-Oriented Programming in C++

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Appendix G time3 = time1 + time2; //add two times cout << “\ntime3 = “; time3.display(); //display result cout << endl; return 0;

}

4.

// ex8_4.cpp

// overloaded arithmetic operators work with type Int

#include <iostream> using namespace std;

#include <process.h> //for exit()

//////////////////////////////////////////////////////////////// class Int

{ private: int i; public:

Int() : i(0) //no-arg constructor

{ }

Int(int ii) : i(ii) //1-arg constructor

{ } // (int to Int) void putInt() //display Int

{ cout << i; } void getInt() //read Int from kbd

{ cin >> i; } operator int() //conversion operator

{ return i; } // (Int to int)

Int operator + (Int i2) //addition

{ return checkit( long double(i)+long double(i2) ); }

Int operator - (Int i2) //subtraction

{ return checkit( long double(i)-long double(i2) ); }

Int operator * (Int i2) //multiplication

{ return checkit( long double(i)*long double(i2) ); }

Int operator / (Int i2) //division

{ return checkit( long double(i)/long double(i2) ); }

Int checkit(long double answer) //check results

{ if( answer > 2147483647.0L || answer < -2147483647.0L )

{ cout << “\nOverflow Error\n”; exit(1); } return Int( int(answer) );

}

};

//////////////////////////////////////////////////////////////// int main()

{