1.Java基本BigInteger:
import java.util.*;
import java.math.*;
public class Test {
public static void main(String[] args){
//输入
Scanner cin=new Scanner(System.in);
BigInteger a=cin.nextBigInteger(); //BigInteger
int b=cin.nextInt(); //Int
double c=cin.nextDouble(); //Double
String s=cin.nextLine(); //String
String g=cin.next();
while(cin.hasNext()){ //相当于!=EOF
}
//输出
System.out.print(a); //类似于cout<<…….;
System.out.println(b); //类似于cout<<……<<endl;
System.out.printf("%d",c); //类似于C中printf的功能
//基础操作
BigInteger Num=new BigInteger(s); //将String转换为10进制BigInteger
BigInteger Num1=new BigInteger(s,2); //将指定进制String转换为10进制BigInteger
BigInteger Add=a.add(Num); //加
BigInteger Substract=a.subtract(Num); //减
BigInteger Multiply=a.multiply(Num); //乘
BigInteger Divide=a.divide(Num); //除
BigInteger Remainder=a.remainder(Num); //取余
BigInteger Mod=a.mod(Num);
BigInteger Pow=a.pow(b); //次方b必须是Int
BigInteger Gcd=a.gcd(Num); //两BigInteger的最大公约数
BigInteger Abs=a.abs(); //取绝对值
BigInteger Max=a.max(Num); //大值
BigInteger Min=a.min(Num); //小值
boolean flag=a.equals(Num); //判等
Num=BigInteger.ONE; //大数常量1
Num=BigInteger.TEN; //大数常量10
Num=BigInteger.ZERO; //大数常量0
}
}
2.Int型
#include <cstdio>
#include <algorithm>
#include <cmath>
#include <iostream>
#include <map>
#include <queue>
#include <cstdlib>
#include <cstring>
#include <string>
#include <ctime>
#include <vector>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ldb;
const ll MOD = 1000000009;
const int INF = 0x3f3f3f3f;
const ll LL_INF = 0x3f3f3f3f3f3f3f3f;
const db PI = acos(-1);
const db ERR = 1e-8;
const int MAXN=9999; //最大存的最大数
const int MAXSIZE=9999; //重载中位数
const int DLEN=4; //存的位数
class BigNum{
private:
int a[500]; //可以控制大数的位数
int len; //大数长度
public:
BigNum(){
len = 1;
memset(a,0,sizeof(a));
} //构造函数
BigNum(const int); //将一个int类型的变量转化为大数
BigNum(const char*); //将一个字符串类型的变量转化为大数
BigNum(const BigNum &); //拷贝构造函数
BigNum &operator=(const BigNum &); //重载赋值运算符,大数之间进行赋值运算
friend istream& operator>>(istream&, BigNum&); //重载输入运算符
friend ostream& operator<<(ostream&, BigNum&); //重载输出运算符
BigNum operator+(const BigNum &) const; //重载加法运算符,两个大数之间的相加运算
BigNum operator-(const BigNum &) const; //重载减法运算符,两个大数之间的相减运算
BigNum operator*(const BigNum &) const; //重载乘法运算符,两个大数之间的相乘运算
BigNum operator/(const int &) const; //重载除法运算符,大数对一个整数进行相除运算
BigNum operator^(const int &) const; //大数的n次方运算
int operator%(const int &) const; //大数对一个int类型的变量进行取模运算
bool operator>(const BigNum & T)const; //大数和另一个大数的大小比较
bool operator>(const int & t)const; //大数和一个int类型的变量的大小比较
void print(); //输出大数
};
BigNum::BigNum(const int b) //将一个int类型的变量转化为大数
{
int c,d = b;
len = 0;
memset(a,0,sizeof(a));
while(d > MAXN)
{
c = d - (d / (MAXN + 1)) * (MAXN + 1);
d = d / (MAXN + 1);
a[len++] = c;
}
a[len++] = d;
}
BigNum::BigNum(const char*s) //将一个字符串类型的变量转化为大数
{
int t,k,index,l,i;
memset(a,0,sizeof(a));
l=strlen(s);
len=l/DLEN;
if(l%DLEN)
len++;
index=0;
for(i=l-1;i>=0;i-=DLEN)
{
t=0;
k=i-DLEN+1;
if(k<0)
k=0;
for(int j=k;j<=i;j++)
t=t*10+s[j]-'0';
a[index++]=t;
}
}
BigNum::BigNum(const BigNum & T) : len(T.len) //拷贝构造函数
{
int i;
memset(a,0,sizeof(a));
for(i = 0 ; i < len ; i++)
a[i] = T.a[i];
}
BigNum & BigNum::operator=(const BigNum & n) //重载赋值运算符,大数之间进行赋值运算
{
int i;
len = n.len;
memset(a,0,sizeof(a));
for(i = 0 ; i < len ; i++)
a[i] = n.a[i];
return *this;
}
istream& operator>>(istream & in, BigNum & b) //重载输入运算符
{
char ch[MAXSIZE*4];
int i = -1;
in>>ch;
int l=strlen(ch);
int count=0,sum=0;
for(i=l-1;i>=0;)
{
sum = 0;
int t=1;
for(int j=0;j<4&&i>=0;j++,i--,t*=10)
{
sum+=(ch[i]-'0')*t;
}
b.a[count]=sum;
count++;
}
b.len =count++;
return in;
}
ostream& operator<<(ostream& out, BigNum& b) //重载输出运算符
{
int i;
cout << b.a[b.len - 1];
for(i = b.len - 2 ; i >= 0 ; i--)
{
cout.width(DLEN);
cout.fill('0');
cout << b.a[i];
}
return out;
}
BigNum BigNum::operator+(const BigNum & T) const //两个大数之间的相加运算
{
BigNum t(*this);
int i,big; //位数
big = T.len > len ? T.len : len;
for(i = 0 ; i < big ; i++)
{
t.a[i] +=T.a[i];
if(t.a[i] > MAXN)
{
t.a[i + 1]++;
t.a[i] -=MAXN+1;
}
}
if(t.a[big] != 0)
t.len = big + 1;
else
t.len = big;
return t;
}
BigNum BigNum::operator-(const BigNum & T) const //两个大数之间的相减运算
{
int i,j,big;
bool flag;
BigNum t1,t2;
if(*this>T)
{
t1=*this;
t2=T;
flag=0;
}
else
{
t1=T;
t2=*this;
flag=1;
}
big=t1.len;
for(i = 0 ; i < big ; i++)
{
if(t1.a[i] < t2.a[i])
{
j = i + 1;
while(t1.a[j] == 0)
j++;
t1.a[j--]--;
while(j > i)
t1.a[j--] += MAXN;
t1.a[i] += MAXN + 1 - t2.a[i];
}
else
t1.a[i] -= t2.a[i];
}
t1.len = big;
while(t1.a[t1.len - 1] == 0 && t1.len > 1)
{
t1.len--;
big--;
}
if(flag)
t1.a[big-1]=0-t1.a[big-1];
return t1;
}
BigNum BigNum::operator*(const BigNum & T) const //两个大数之间的相乘运算
{
BigNum ret;
int i,j,up;
int temp,temp1;
for(i = 0 ; i < len ; i++)
{
up = 0;
for(j = 0 ; j < T.len ; j++)
{
temp = a[i] * T.a[j] + ret.a[i + j] + up;
if(temp > MAXN)
{
temp1 = temp - temp / (MAXN + 1) * (MAXN + 1);
up = temp / (MAXN + 1);
ret.a[i + j] = temp1;
}
else
{
up = 0;
ret.a[i + j] = temp;
}
}
if(up != 0)
ret.a[i + j] = up;
}
ret.len = i + j;
while(ret.a[ret.len - 1] == 0 && ret.len > 1)
ret.len--;
return ret;
}
BigNum BigNum::operator/(const int & b) const //大数对一个整数进行相除运算
{
BigNum ret;
int i,down = 0;
for(i = len - 1 ; i >= 0 ; i--)
{
ret.a[i] = (a[i] + down * (MAXN + 1)) / b;
down = a[i] + down * (MAXN + 1) - ret.a[i] * b;
}
ret.len = len;
while(ret.a[ret.len - 1] == 0 && ret.len > 1)
ret.len--;
return ret;
}
int BigNum::operator %(const int & b) const //大数对一个int类型的变量进行取模运算
{
int i,d=0;
for (i = len-1; i>=0; i--)
{
d = ((d * (MAXN+1))% b + a[i])% b;
}
return d;
}
BigNum BigNum::operator^(const int & n) const //大数的n次方运算
{
BigNum t,ret(1);
int i;
if(n<0)
exit(-1);
if(n==0)
return 1;
if(n==1)
return *this;
int m=n;
while(m>1)
{
t=*this;
for( i=1;i<<1<=m;i<<=1)
{
t=t*t;
}
m-=i;
ret=ret*t;
if(m==1)
ret=ret*(*this);
}
return ret;
}
bool BigNum::operator>(const BigNum & T) const //大数和另一个大数的大小比较
{
int ln;
if(len > T.len)
return true;
else if(len == T.len)
{
ln = len - 1;
while(a[ln] == T.a[ln] && ln >= 0)
ln--;
if(ln >= 0 && a[ln] > T.a[ln])
return true;
else
return false;
}
else
return false;
}
bool BigNum::operator >(const int & t) const //大数和一个int类型的变量的大小比较
{
BigNum b(t);
return *this>b;
}
void BigNum::print() //输出大数
{
int i;
cout << a[len - 1];
for(i = len - 2 ; i >= 0 ; i--)
{
cout.width(DLEN);
cout.fill('0');
cout << a[i];
}
cout << endl;
}
3.String型
string sum(string s1,string s2) //大数加法
{
if(s1.length()<s2.length())
{
string temp=s1;
s1=s2;
s2=temp;
}
int i,j;
for(i=s1.length()-1,j=s2.length()-1;i>=0;i--,j--)
{
s1[i]=char(s1[i]+(j>=0?s2[j]-'0':0));
if(s1[i]-'0'>=10)
{
s1[i]=char((s1[i]-'0')%10+'0');
if(i) s1[i-1]++;
else s1='1'+s1;
}
}
return s1;
}
string sub(string a,string b)//减法
{
string c;
bool ok=0;
int len1=a.length();
int len2=b.length();
int len=max(len1,len2);
for(int i=len1;i<len;i++)
a="0"+a;
for(int i=len2;i<len;i++)
b="0"+b;
if(a<b)
{
string temp=a;
a=b;
b=temp;
ok=1;
}
for(int i=len-1;i>=0;i--)
{
if(a[i]<b[i])
{
a[i-1]-=1;
a[i]+=10;
}
char temp=a[i]-b[i]+'0';
c=temp+c;
}
int pos=0;
while(c[pos]=='0' && pos<len) pos++;
if(pos==len) return "0";
if(ok) return "-"+c.substr(pos);
return c.substr(pos);
}
string Multiply(string s,int x) //大数乘以整形数
{
reverse(s.begin(),s.end());
int cmp=0;
for(int i=0;i<s.size();i++)
{
cmp=(s[i]-'0')*x+cmp;
s[i]=(cmp%10+'0');
cmp/=10;
}
while(cmp)
{
s+=(cmp%10+'0');
cmp/=10;
}
reverse(s.begin(),s.end());
return s;
}
string Multfa(string x,string y) //大数乘法
{
string ans;
for(int i=y.size()-1,j=0;i>=0;i--,j++)
{
string tmp=Mult(x,y[i]-'0');
for(int k=0;k<j;k++)
tmp+='0';
ans=sum(ans,tmp);
}
return ans;
}
string Multiply(string s,long x) //大数乘以整形数
{
reverse(s.begin(),s.end());
long cmp=0;
for(int i=0; i<s.size(); i++)
{
cmp=(s[i]-'0')*x+cmp;
s[i]=(cmp%10+'0');
cmp/=10;
}
while(cmp)
{
s+=(cmp%10+'0');
cmp/=10;
}
reverse(s.begin(),s.end());
return s;
}
string Except(string s,int x) //大数除以整形数
{
int cmp=0,ok=0;
string ans="";
for(int i=0;i<s.size();i++)
{
cmp=(cmp*10+s[i]-'0');
if(cmp>=x)
{
ok=1;
ans+=(cmp/x+'0');
cmp%=x;
}
else{
if(ok==1)
ans+='0';
}
}
return ans;
}
int mod(string s,int x)//大数取余
{
int len=s.length();
int ans=0;
for(int i=0;i<len;i++)
{
ans=(ans*10+s[i]-'0')%x;
}
return ans;
}
string factorial(string s,int n) //浮点数的n次方
{
if(n==0)
return "1";
string cmp="",count="";
long x=0,point=0;
for(int i=0; i<s.size(); i++)
if(s[i]!='.')
{
cmp+=s[i];
x=x*10+(s[i]-'0');
}
else
point=s.size()-1-i;
for(int i=1; i<n; i++)
{
cmp=Multiply(cmp,x);
}
int ans_point=cmp.size()-n*point;
if(ans_point<0)
{
count+='.';
for(int i=ans_point; i!=0; i++)
count+='0';
}
string::iterator it=cmp.begin();
if(ans_point>=0&&ans_point<cmp.size())
cmp.insert(it+ans_point,'.');
count+=(Remove_later(cmp));
return count;
}
string Remove_later(string s) //删除一个字符串的后倒0
{
for(int i=s.size()-1; i>=0; i--)
{
if(s[i]=='0')
s.erase(i);
else
break;
}
return s;
}
string solve(string s)//判等
{
int len=s.length();
bool ok=false;
int x=0,y=len-1;
for(int i=0;i<len;i++)
{
if(s[i]=='.')
{
ok=true;
break;
}
}
if(ok)
{
for(;y>=x;y--)
if(s[y]!='0') break;
if(s[y]=='.') y--;
}
for(;x<len-1;x++)
if(s[x]!='0') break;
if(s[x]=='.') x--;
return s.substr(x,y-x+1);
}
bool equal(string s1,string s2)
{
if(s1[0]=='-' && s2[0]=='-')
{
s1=s1.substr(1);
s2=s2.substr(1);
}
else if(s1[0]=='-' || s2[0]=='-')
{
if(s1[0]=='-') s1=s1.substr(1);
if(s2[0]=='-') s2=s2.substr(1);
s1=solve(s1);
s2=solve(s2);
if(s1=="0" && s2=="0") return true;
return false;
}
if(s1[0]=='+') s1=s1.substr(1);
if(s2[0]=='+') s2=s2.substr(1);
s1=solve(s1);
s2=solve(s2);
if(s1==s2) return true;
return false;
}