我的输出错了。 [英] I am getting wrong output.
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问题描述
<pre>#include <iostream>
using namespace std;
class fraction
{
long num;
long den;
public:
fraction();
fraction(long,long);
fraction(const fraction &);
~fraction();
long getNum (void)const;
long getDen (void)const;
void print (void);
fraction inc ();
friend fraction add (const fraction &f1, const fraction &f2);
friend fraction sub (const fraction &f1, const fraction &f2);
friend fraction mult(const fraction &f1, const fraction &f2);
friend fraction div (const fraction &f1, const fraction &f2);
};
fraction::fraction( )
{
num = 0L ;
den = 1L ;
}
fraction::fraction(long l_num,long l_den)
{
num = l_num ;
den = l_den ;
}
fraction::fraction(const fraction& f)
{
num=f.num;
den=f.den;
}
fraction:: ~fraction ( )
{
//cout<<"Destructor"<<endl;
}
long fraction::getNum (void) const
{
return num ;
}
long fraction::getDen (void) const
{
return den ;
}
void fraction:: print (void)
{
if(den==0)
den=1L;
cout<<num<<"/"<<den <<endl;
}
fraction fraction:: inc ( )
{
// long num ;
// long den ;
long num = (num) + (den);
long den = (den);
return fraction(num, den);
}
fraction add ( const fraction &f1, const fraction &f2)
{
long num = (f1.getNum ( ) * f2.getDen ( )) + ( f1.getDen ( ) * f2.getNum ( ) );
long den = (f1.getDen ( ) * f2.getDen ( ));
return fraction(num, den);
}
fraction sub ( const fraction &f1, const fraction &f2)
{
long num = (f1.getNum ( ) * f2.getDen ( )) - ( f1.getDen ( ) * f2.getNum ( ) );
long den = (f1.getDen ( ) * f2.getDen ( ));
return fraction(num, den);
}
fraction mult ( const fraction &f1, const fraction &f2)
{
long num = (f1.getNum ( ) * f2.getNum ( ));
long den = (f1.getDen ( ) * f2.getDen ( ));
return fraction(num, den);
}
fraction div ( const fraction &f1, const fraction &f2)
{
long num = (f1.getNum ( ) * f2.getDen ( ));
long den = (f1.getDen ( ) * f2.getNum ( ));
return fraction(num, den);
}
int main()
{
fraction f1,f2(5L,0L);
fraction f3(f2);
f1.print();
f2.print();
f3.print();
f3 = add(f3 , fraction (-7,8) );
f1 = add(f2,f3);
f1.print ();
f1 = sub(f2 , f3);
f1.print();
f1 = mult(f2, f3);
f1.print();
f1.inc().inc().print();
f1=div(f2 , f3 );
f1.print();
return 0;
}
< b
我尝试过:
<b
What I have tried:
I am getting wrong output on 7th output.I should get 181/8. but I am getting 7012088/165. I think it is due to uninitialized parameters, but still could not figure out. Please advice. Thank you
推荐答案
我得到:
I get:
0/1
5/1
5/1
73/8
7/8
165/8
8/1
40/33
所以第七个输出是8/1
如果你看一下inc函数,很明显:
So the seventh output would be 8/1
If you look at the inc function, it's pretty obvious:
fraction fraction:: inc ( )
{
// long num ;
// long den ;
long num = (num) + (den);
long den = (den);
return fraction(num, den);
}
你的两个新的局部变量会掩盖类级变量,所以当你使用这些值时,你得到的是未初始化的本地值,而不是类级别的值。
试试这个:
Your two new local variables mask the class level variables so when you use the values you get local, uninitialized values instead of the class level ones.
Try this:
fraction fraction:: inc ( )
{
long numX = (num) + (den);
long denX = (den);
return fraction(numX, denX);
}
它会起作用。
And it'll work.
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