?? pow_doub.cpp
字號:
#include <iostream.h>
class pwr {
double b;
int e;
double val;
public:
pwr(double base, int exp);
pwr operator+(pwr obj)
{
double base;
int exp;
base = b + obj.b;
exp = e + obj.e;
pwr temp(base, exp);
return temp;
}
operator double(void) {return val;} // converts to double
};
pwr::pwr(double base, int exp)
{
b = base;
e = exp;
val = 1;
if (exp!=0)
while(exp-- > 0)
val *= b;
}
void main(void)
{
pwr pwr1(4.0, 2);
double doub1;
doub1 = pwr1; // convert x to double
cout << (doub1 + 100.2) << endl;
pwr pwr2(3.3, 3), pwr3(0,0);
pwr3 = pwr1 + pwr2; // no conversion
doub1 = pwr3; // convert to double
cout << doub1;
}
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