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Views: 1883 | Replies: 4
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Join Date: Aug 2007
Posts: 6
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Newbie Poster
overloading operator >> Hi i've have this problem in my code when i do the overloading of operator >>. My problem for this code isnt encounter error but my input like say i input 7, the num.a output will change this 7 to 55 and num.b output for 5 to 53. below is the code.
my format of input is (7+i3). This is a complex number format. Hope to hear the reply soon.Thanks
class Complex
{
friend istream& operator>>(istream&, Complex&);
friend ostream& operator<<(ostream&, const Complex&);
public:
Complex(int a=0, int b=0) {}; // constructors
Complex operator +(Complex);
Complex operator *(Complex);
bool operator ==(const Complex&) const;
bool operator >(const Complex&) const;
private:
int a, b;
};
istream& operator>>(istream &in, Complex &num)
{
string line="";
fflush(stdin);
in>>line;
for(int i=0; i<line.length(); i++)
{
if(i==1)
{
num.a = line[i];
}
else if(i==4)
{
num.b = line[i];
}
}
return in;
}my format of input is (7+i3). This is a complex number format. Hope to hear the reply soon.Thanks
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Join Date: Oct 2007
Location: Cherry Hill, NJ
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Step by step.
1. Don't fflush(). There is no need and you shouldn't be mixing C and C++ I/O anyway.
2. You are mis-indexing the string:
Hence, line[1] == '+' and line[4] == '\0'. BTW, i never reaches 4 if your input is only four characters long.
3. You are not converting your numbers. The ASCII value of '+' is 43.
4. Your constructor should look like this:
or
The first way is preferred.
The reason num.b is some weird number is because your constructor never initializes the private fields a and b. Having arguments with the same name makes no difference.
PS. Complex numbers are normally written a + bi. If you do the same you will have an easier time collecting and verifying input.
Hope this helps.
1. Don't fflush(). There is no need and you shouldn't be mixing C and C++ I/O anyway.
2. You are mis-indexing the string:
012347+i3Hence, line[1] == '+' and line[4] == '\0'. BTW, i never reaches 4 if your input is only four characters long.
3. You are not converting your numbers. The ASCII value of '+' is 43.
4. Your constructor should look like this:
Complex( int _a=0, int _b=0 ): a( _a ), b( _b ) {};or
Complex( int _a=0, int _b=0 ) { a = _a; b = _b; }The first way is preferred.
The reason num.b is some weird number is because your constructor never initializes the private fields a and b. Having arguments with the same name makes no difference.
PS. Complex numbers are normally written a + bi. If you do the same you will have an easier time collecting and verifying input.
Hope this helps.
Last edited by Duoas : Nov 8th, 2007 at 3:20 am.
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Join Date: Aug 2007
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Newbie Poster
Thanks alot. actually my problem lies with the line[i] thing, like you have explain. It turn out to be taken as ASCii '7' instead of int '7' thats y it output to 55. I actually did my changes by adding line[i] - 48 to it to make it back to '7'. Really thanks alot abt the constructor thing.
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