__int 128用法 （可以处理约 1e38 范围内的数）

    1. inline __int128 read() {
    2.     __int128 x=0,f=1;
    3.     char ch=getchar();
    4.     while(ch<'0'||ch>'9') {
    5.         if(ch=='-')
    6.             f=-1;
    7.         ch=getchar();
    8.     }
    9.     while(ch>='0'&&ch<='9') {
    10.         x=x*10+ch-'0';
    11.         ch=getchar();
    12.     }
    13.     return x*f;
    14. }
    16. inline void print(__int128 x) {
    17.     if(x<0) {
    18.         putchar('-');
    19.         x=-x;
    20.     }
    21.     if(x>9)
    22.         write(x/10);
    23.     putchar(x%10+'0');
    24. }

    JAVA大数类实现

    1. import java.math.BigInteger;
    2. import java.io.*;
    4. public class Main {
    5.     public static void main(String[] args) throws IOException {
    6.         BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
    7.         BigInteger a = new BigInteger(reader.readLine());
    8.         BigInteger b = new BigInteger(reader.readLine());
    9.         System.out.println(a.add(b));
    10.         System.out.println(a.subtract(b));
    11.         System.out.println(a.multiply(b));
    12.         System.out.println(a.divide(b));
    13.         System.out.println(a.mod(b));
    14.         reader.close();
    15.     }
    16. }