HDU 1002 A + B Problem II(大数加法,C,Java两个版本)



A + B Problem II

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)

Total Submission(s): 300365 Accepted Submission(s): 57917

[align=left]Problem Description[/align]
I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B.

Input

The first line of the input contains an integer T(1<=T<=20) which means the number of test cases. Then T lines follow, each line consists of two positive integers, A and B. Notice that the integers are very large, that means
you should not process them by using 32-bit integer. You may assume the length of each integer will not exceed 1000.

Output

For each test case, you should output two lines. The first line is "Case #:", # means the number of the test case. The second line is the an equation "A + B = Sum", Sum means the result of A + B. Note there are some spaces
int the equation. Output a blank line between two test cases.

Sample Input

2
1 2
112233445566778899 998877665544332211

Sample Output

Case 1:
1 + 2 = 3

Case 2:
112233445566778899 + 998877665544332211 = 1111111111111111110

Author

Ignatius.L

原题链接:http://acm.hdu.edu.cn/showproblem.php?pid=1002

大数加法,不解释!

AC代码

#include <cstdio>
#include <cstring>
#define maxn 1005
int main()
{
int n;
int da[maxn],db[maxn],c[maxn];
char a1[maxn],a2[maxn];
scanf("%d",&n);
for(int kase=1; kase<=n; kase++)
{
scanf("%s",a1);
scanf("%s",a2);
printf("Case %d:\n",kase);
printf("%s + %s = ",a1,a2);
int len1=strlen(a1);
int len2=strlen(a2);
memset(da,0,sizeof(da));
memset(db,0,sizeof(db));
memset(c,0,sizeof(c));
int len=len1>len2?len1:len2;
int k=0;
for(int i=len1-1; i>=0; i--)
da[k++]=a1[i]-'0';
k=0;
for(int i=len2-1; i>=0; i--)
db[k++]=a2[i]-'0';
int carry=0;
for(int i=0; i<len; i++)
{
c[i]=(da[i]+db[i]+carry)%10;
carry=(da[i]+db[i]+carry)/10;
}
bool start=false;//此变量用于跳过多余的0
for(int i=len; i>=0; i--)
{
if(start)
printf("%d",c[i]);//如果跳过多余的0,则输出
else if(c[i])
{
printf("%d",c[i]);
start=true;//遇到第一个非0值,则跳过多余的0
}
}
printf("\n");
if(kase!=n)
printf("\n");
}
}<span style="font-size:18px;color:#3333ff;">
</span>

Java大数

import java.math.BigInteger;
import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n =sc.nextInt();
for(int i=1;i<=n;i++){
BigInteger a = sc.nextBigInteger();
BigInteger b = sc.nextBigInteger();
System.out.println("Case "+i+":");
System.out.println(a+" + "+b+" = "+a.add(b));
if(i!=n){
System.out.println();
}
}
}
}