重载运算符

短命女 2022-07-11 12:05 244阅读 0赞

#include<iostream>
    #include<string.h>
    #include<stdio.h>
    
    using namespace std;
    
    const int MAXN=4000;
    
    struct Bignum{
        int len,s[MAXN];
        string condition;
        inline int max(int a,int b){
            return a>b?a:b;
        }
        inline void swap(Bignum &a,Bignum &b)
        {
            Bignum t=a;
            a=b;
            b=t;
        }
        inline void BignumGet(string &s,Bignum *a,char *ch){
            bool flag=true;
            int k=0,k2=0;;
            int record[1001]={
       0};
            for (auto i:s)
            {
                if (!(s[i]>='0'&&s[i]<=9)){
                    ch[k]=s[i];
                    k++;
                    record[k2]=i;
                }
            }
            for (int i=1;i<=k2;i++)
            {
    
            }
        }
        Bignum()
        {
            len=1;
            memset(s,0,sizeof(s));
        }
        Bignum(const char *num){*this=num;}
        Bignum(int num){*this=num;}
        Bignum operator=(const char *num)
        {
            len=strlen(num);
            for (int i=0;i<len;i++)
            {
                s[i]=num[len-i-1]-'0';
            }
            return *this;
        }
        Bignum operator=(const string s1)
        {
            condition=s1;
            return *this;
        }
        Bignum operator=(const int num)//存储 
        {
            char a[MAXN];
            sprintf(a,"%d",num);
            *this=a;
            return *this;
        }
        Bignum operator+(const Bignum &a)//重载加法 
        {
            Bignum c;
            c.len=max(len,a.len)+1;
            for (int i=0,x=0;i<c.len;++i)
            {
                c.s[i]=a.s[i]+s[i]+x;
                x=c.s[i]/10;
                c.s[i]%=10;
            }
            if (c.s[c.len-1]==0)--c.len;
            return c;
        }
        Bignum operator+=(const Bignum &a)
        {
            return *this+a;
        }
        Bignum operator-(Bignum &num){
       //重载减法 
            Bignum b=*this;
            Bignum a=num;
            bool flag=false;
            if (b<a){
                swap(b,a);
                flag=true;
                cout<<'-';
            }
            b.len=max(a.len,b.len);
            for (int i=0,x=0;i<b.len;i++){
                if (b.s[i]<a.s[i]){
                    b.s[i]=b.s[i]+10-a.s[i];
                   b.s[i+1]--;
                }else {
                    b.s[i]=b.s[i]-a.s[i];
                }
            }
            while (b.s[b.len-1]==0)b.len--;
            return b;
        }
        Bignum operator*(const Bignum &a)//重载高精度乘法 
        {
            Bignum c;
            c.len=len+a.len;
            for (int i=0;i<len;i++)
            {
              for (int j=0;j<a.len;j++)
                {
                    c.s[i+j]+=a.s[j]*s[i];
                    c.s[i+j+1]+=c.s[i+j]/10;
                    c.s[i+j]%=10;
    
                }   
            }
            while(c.s[c.len-1]==0)c.len--;
            return c;
        }
        Bignum operator*(const int a)//乘法 
        {
            Bignum c=a;
            return *this*c;
        }
        Bignum operator*=(const Bignum &a)
        {
            *this=*this*a;
            return *this;
        }
        bool operator <(const Bignum&x)const{
       //重载<号 
            if (len!=x.len) return len<x.len;
            for (int i=len-1;i>=0;i--)
            {
                if (s[i]!=x.s[i])return s[i]<x.s[i];
            }
            return false;
        }
        bool operator >(const Bignum&x)const{
       return x<*this;}//重载>号 
        bool operator <=(const Bignum&x)const{
       return !(x<*this);}//重载<=号 
        bool operator >=(const Bignum&x)const{
       return !(*this<x);}//重载>=号 
        bool operator ==(const Bignum&x)const{
       return !(x<*this||x>*this);}//重载==号 
        bool operator !=(const Bignum&x)const{
       return (x<*this||x>*this);}//重载！=号 
    
    };
    ostream &operator<<(ostream &out,const Bignum&x){
       //输出流 
        if (x.condition.empty()){
            cout<<x.condition;
            string a;
            return out;
        }
        for (int i=x.len-1;i>=0;i--)
          cout<<x.s[i];
        return out;
    }
    istream &operator>>(istream &in,Bignum&x){
       //输入流 
        char num[MAXN];
        in>>num;
        x=num;
        return in;
    }
    
    
    int main()
    {
        Bignum a,b;
        cin>>a;
        cout<<a*99;
    }