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  • hdu 1002 A+B

    题目:http://acm.hdu.edu.cn/showproblem.php?pid=1002

    复习一下大数

    模板:

     1 #include <stdio.h>
     2 #include <string.h>
     3 #include <stdlib.h>
     4 #include <math.h>
     5 #include <assert.h>
     6 #include <ctype.h>
     7 #include <map>
     8 #include <string>
     9 #include <set>
    10 #include <bitset>
    11 #include <utility>
    12 #include <algorithm>
    13 #include <vector>
    14 #include <stack>
    15 #include <queue>
    16 #include <iostream>
    17 #include <fstream>
    18 #include <list>
    19 using  namespace  std;
    20 
    21 const  int MAXL = 1005;
    22 struct  BigNum
    23 {
    24     int  num[MAXL];
    25     int  len;
    26     BigNum()
    27     {
    28         memset(num,0,sizeof(num));
    29     }
    30 };
    31 
    32 //高精度加法
    33 BigNum  Add(BigNum &a, BigNum &b)
    34 {
    35     BigNum c;
    36     int  i, len;
    37     len = (a.len > b.len) ? a.len : b.len;
    38     memset(c.num, 0, sizeof(c.num));
    39     for(i = 0; i < len; i++)
    40     {
    41         c.num[i] += (a.num[i]+b.num[i]);
    42         if(c.num[i] >= 10)
    43         {
    44             c.num[i+1]++;
    45             c.num[i] -= 10;
    46         }
    47     }
    48     if(c.num[len])
    49         len++;
    50     c.len = len;
    51     return  c;
    52 }
    53 void  print(BigNum &a)   //输出大数
    54 {
    55     int  i;
    56     for(i = a.len-1; i >= 0; i--)
    57         printf("%d", a.num[i]);
    58     printf("
    ");
    59 }
    60 
    61 
    62 void Init(BigNum &a, char *s, int &tag)   //将字符串转化为大数
    63 {
    64     int  i = 0, j = strlen(s);
    65     if(s[0] == '-')
    66     {
    67         j--;
    68         i++;
    69         tag *= -1;
    70     }
    71     a.len = j;
    72     for(; s[i] != ''; i++, j--)
    73         a.num[j-1] = s[i]-'0';
    74 }
    75 
    76 int main(void)
    77 {
    78     //freopen("in.txt","r",stdin);
    79     int T;
    80     char  s1[MAXL], s2[MAXL];
    81     scanf("%d",&T);
    82     for(int t=1;t<=T;t++)
    83     {
    84         BigNum a,b,c;
    85         memset(s1,0,sizeof(s1));
    86         memset(s2,0,sizeof(s2));
    87         scanf("%s %s",s1,s2);
    88         int tag=1;
    89         Init(a,s1,tag);
    90         Init(b,s2,tag);
    91         c=Add(a,b);
    92         if(t!=1)
    93         printf("
    ");
    94         printf("Case %d:
    ",t);
    95         printf("%s + %s = ",s1,s2);
    96         print(c);
    97     }
    98     return 0;
    99 }

    普通:

     1 #include<iostream>
     2 #include<string.h>
     3 #include<math.h>
     4 #include<stdlib.h>
     5 #include<stdio.h>
     6 using namespace std;
     7 const int M=1005;
     8 void xsone(int a[],int b[],int lenz)
     9 {
    10     for(int i=0;i<lenz;i++)
    11     a[i]=a[i]+b[i];
    12     int temp=0;
    13     for(int i=0;i<lenz+1;i++)
    14     {
    15         a[i]+=temp;
    16         temp=a[i]/10;
    17         a[i]%=10;
    18     }
    19     int i;
    20     for(i=lenz+1;i>=0;i--)
    21     if(a[i]!=0)
    22     break;
    23     for(;i>=0;i--)
    24     printf("%d",a[i]);
    25     printf("
    ");
    26 }
    27 int main()
    28 {
    29     //freopen("in.txt","r",stdin);
    30     int n;
    31     scanf("%d",&n);
    32     for(int i=1;i<=n;i++)
    33     {
    34         char sa[M],sb[M];
    35         memset(sa,0,sizeof(sa));
    36         memset(sb,0,sizeof(sb));
    37         scanf("%s %s",sa,sb);
    38         int lena = strlen(sa);
    39         int lenb = strlen(sb);
    40         int lenz = lena>lenb ?lena :lenb;
    41 
    42         int a[M],b[M];
    43         memset(a,0,sizeof(a));
    44         memset(b,0,sizeof(b));
    45         int j;
    46         for(j=0;j<lena;j++)
    47         a[lena-1-j]=sa[j]-'0';
    48         for(j=0;j<lenb;j++)
    49         b[lenb-1-j]=sb[j]-'0';
    50         printf("Case %d:
    ",i);
    51         printf("%s + %s = ",sa,sb);
    52         xsone(a,b,lenz);
    53         if(i!=n)
    54         printf("
    ");
    55     }
    56     return 0;
    57 }
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  • 原文地址:https://www.cnblogs.com/xuesen1995/p/4348440.html
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