為帶符號大整數定義乙個類。將帶符號大整數表示成兩個值:乙個是絕對值,用無符號大整數表示,乙個是符號,用整形數表示,1表示正號,-1表示負號。
過載輸入和輸出運算子》和<<。帶符號大整數以-1234567890,1234567890668這樣的形式來輸入和輸出。注意可能在輸入時包含有正號,所以必須支援像+1234567890這樣的輸入。過載以下所有運算子,:+,-,*,/。
#include#includeusing namespace std;
class biginter
biginter(string a)
else
}friend ostream& operator<<(ostream& out, biginter a);
friend istream& operator>>(istream& in, biginter &a);
biginter operator+(biginter &a);
biginter operator-(biginter &a);
biginter operator*(const biginter &a);
biginter operator/(const biginter &a);
~biginter() {};
};biginter biginter:: operator +(biginter &a)
else if (a.signal == 1 && this->signal == -1)
for ( i = 0; i < tmp.size() && i < tmp1.size(); i++)
else
flag = 0;
} if (tmp.size() == tmp1.size() && flag == 1)
tmp2.push_back('1');
if (isignal == 1)
res.signal = 1;
else
res.signal = -1;
return res;
} if (isignal == 1)
res.signal = 1;
else
res.signal = -1;
return res;
} reverse(tmp2.begin(), tmp2.end());
res.num = tmp2;
if (a.signal == 1 && this->signal == 1)
res.signal = 1;
else
res.signal = -1;
return res;
}biginter biginter:: operator -(biginter &a)
else if (a.signal == 1 && this->signal == -1)
int flag1=0;
if (a.num.size() == this->num.size())
else if (tmp[i] < tmp1[i])
}for (i = 0; i < tmp.size() && i < tmp1.size(); i++)
else
tmp2.push_back(ch);
} for (int i = tmp2.size() - 1; i >= 0; i--)//去除前導0
else
break;
} reverse(tmp2.begin(), tmp2.end());
res.num = tmp2;
if ((a.signal == -1&&flag1==1)||(a.signal==1&&flag1==0))
else
return res;
} if (a.num.size() > this->num.size())
for (i = 0; i < tmp.size() && i < tmp1.size(); i++)
else
tmp2.push_back(ch);
} if (i= 0 && tmp1[i] + flag - '0' <= 9)
else
tmp2.push_back(ch);
i++;
while (i < tmp1.size())
else
tmp2.push_back(ch);
i++;
} for (int i = tmp2.size() - 1; i >= 0; i--)
else
break;
} reverse(tmp2.begin(), tmp2.end());
res.num = tmp2;
if ((this->signal == 1 && a.signal == 1&&flag2==0)||(this->signal == -1 && a.signal == -1 && flag2 == 1))
else
return res; }}
biginter biginter:: operator *(const biginter &a)
for (int j = 0; j < s1.size(); j++)
if (flag != 0)
reverse(tmp.num.begin(), tmp.num.end());
res.num = (res + tmp).num;
tmp.num="";
} res.signal = a.signal*this->signal;
return res;
}biginter biginter:: operator /(const biginter &a)
n1 = n * s2;
s1 = s1 - n1;
if (n != 0)
t = s1.num.size() - s2.num.size() - 1 > 0;
} while ((s1 - s2).signal!=-1)
tmp.signal = this->signal*a.signal;
return tmp;
}istream& operator>>(istream& in, biginter &a)
else if (s[0] == '+')
else
return in;
}ostream& operator<<(ostream& out, biginter a)
else
return out;
}int main()
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