C++ examples for Class:Operator Overload
Overloaded arithmetic operators work with type Int
#include <iostream> using namespace std; #include <process.h> //for exit() class Int/*from ww w . ja v a 2s .c o m*/ { 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() { Int alpha = 20; Int beta = 7; Int delta, gamma; gamma = alpha + beta; //27 cout << "\ngamma="; gamma.putInt(); gamma = alpha - beta; //13 cout << "\ngamma="; gamma.putInt(); gamma = alpha * beta; //140 cout << "\ngamma="; gamma.putInt(); gamma = alpha / beta; //2 cout << "\ngamma="; gamma.putInt(); delta = 2147483647; gamma = delta + alpha; //overflow error delta = -2147483647; gamma = delta - alpha; //overflow error cout << endl; return 0; }