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 }