C++

Forum

 
Handling certain cases [Help]

raynierl (16)
The program has no problem adding,subtracting or doing scalar multiplication as long as variable a and b are there but, if I want to add ex: 2+4i with 2 , then the computer has a problem. Also it does not work if i have something like this 4+i. how do i modify my program to ALSO handle these cases. I am also using operator overloading on {+,-,*,<<,>>} and everything is in a class.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
 
#include<iostream>
using namespace std;
int Menu();
class Complex
{
	private:
		int a,b,c,d;
	public:
		Complex();
		Complex(int, int);
	Complex operator+ (Complex);
	Complex operator- (Complex);
	Complex operator* (int);
	friend ostream & operator<< (ostream &, Complex &);
	friend istream & operator>> (istream &, Complex &);		
};
Complex::Complex()
{
	a=b=0;
}
Complex::Complex(int a1,int b1)
{
	a = a1;
	b = b1;
}
Complex Complex::operator+(Complex X)
{
	Complex temp;
	temp.a = X.a + a;
	temp.b = X.b + b;
	return temp;
}
Complex Complex::operator-(Complex X)
{
	Complex temp;
	temp.a = X.a - a;
	temp.b = X.b - b;
	return temp;
}
Complex Complex::operator*(int scalar)
{
	Complex temp;
	temp.a = scalar*a;
	temp.b = scalar*b;
	return temp;
} 
istream& operator >> (istream &Ip, Complex &P)
{
 cout << "Please enter a Complex number" << endl;
 Ip >> P.a; // input a 
 Ip >> P.b; // input b
 Ip.ignore(); // skip (i)
 return Ip;
}
ostream& operator << (ostream &Ip,Complex &P)
{
	if (P.b < 0)
	Ip << "(" << P.a<< " - " << -1*P.b << "i)"; 
	else
	Ip << "(" << P.a<< "+" << P.b << "i)"; 
	return Ip;
}
int main()
{
	char REDO = 'y';
	int a,b,scalar;
	while(REDO == 'y')
	{
	Complex c1,c2,c3;
	cin >>c1;
		switch(Menu())
		{
		case 1 : cout << "Add\n";
		cout << "Enter a second Complex number\n";
		cin >>c2;
		c3=c1+c2;
		cout << c1 << "+" << c2 << " = " << c3 << endl;
		break;
		case 2 : cout << "Subtract\n";
		cout << "Enter a second Complex number\n";
		cin >>c2;
		c3=c1-c2;
		cout << c1 << " - " << c2 << " = " << c3 <<endl;
		break;
		case 3 : cout << "Scalar Multiplication\n";
		cout << "Scalar = ";
		cin >> scalar;	
		c3=c1*scalar;
		cout <<c1 << "(" << scalar << ") = " << c3 << endl;
		break;
		}
		cout << "Would you like to do another? (Y/N)\n";
		cin >> REDO;
		if (REDO == 'Y')
		REDO = 'y';
		system("cls");
	}
	return 0;
}
int Menu()
{
	int choice = 0;
	cout << "What operation would you like performed." << endl;
	cout << "1.Add\n2.Subtract\n3.Scalar Multiplication\n";
	cin >> choice;
	if (choice < 0 or choice > 3)
		cout << "Enter a valid Entry!\n";
	else
		cout << "Choice = ";
		return choice;
}
lastchance (6980)
I'm not sure if you meant representing a number as 2+4i - Matlab can do it but c++ can't.

If you are trying to add complex (4,2) with real number 2 then you will have to overload the + operator again for the combination complex + int (since I note that you are defining your complex numbers to have the (slightly restrictive) integer real and imaginary parts). You will then probably end up doing the same for int + complex etc.

There is a standard complex class - you might want to look it up to see what operators and member functions it defines.
Topic archived. No new replies allowed.