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Hi there,
I'm trying to overload insertion (<<) and extraction (>>) operators and
the program yields output I didn't expect. Could someone please clarify
what's wrong with my program.
Thanks,
Ceo
// program start
#include <iostream.h>
const int size=3;
class vector {
private:
int v[size];
public:
vector();
vector(int *x);
friend vector operator *(int a, vector b);
friend vector operator *(vector b, int a);
friend istream & operator >>(istream &, vector &);
friend ostream & operator <<(ostream &, vector &);
};
vector :: vector() {
for(int i=0; i<size; i++) {
v[i] = 0;
}
}
vector :: vector(int *x) {
for(int i=0; i<size; i++) {
v[i] = x[i];
}
}
vector operator *(int a, vector b) {
vector c;
for(int i=0; i<size; i++) {
c.v[i] = a * b.v[i];
}
return c;
}
vector operator *(vector b, int a) {
vector c;
for(int i=0; i<size; i++) {
c.v[i] = b.v[i] * a;
}
return c;
}
istream & operator >> (istream & din, vector & b) {
for(int i=0; i<size; i++) {
din >> b.v[i];
}
return din;
}
ostream & operator << (ostream & dout, vector & b) {
dout << "(" << b.v[0];
for(int i=0; i<size; i++) {
dout << ", " << b.v[i];
}
dout << ")";
return dout;
}
int x[size] = {2,4,6};
int main() {
vector m;
vector n = x;
cout << "size = " << size << "\n\n";
cout << "Enter elements of vector m " << "\n";
cin >> m;
cout << "\n";
cout << "m = " << m << "\n";
vector p, q;
p = 2 * m;
q = n * 2;
cout << "\n";
cout << "p = " << p << "\n";
cout << "q = " << q << "\n";
return 0;
}
// program end
// output start
size = 3
Enter elements of vector m
1 2 3
m = (1, 1, 2, 3)
p = (2, 2, 4, 6)
q = (4, 4, 8, 12)
// output end
// But I want the output to be:
size = 3
Enter elements of vector m
1 2 3
m = (1, 2, 3)
p = (2, 4, 6)
q = (4, 8, 12)
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