HDU - 1002 A + B Problem II (大整数加法)

一道很基础的大整数加法。

简单的说一下思路吧。

先用字符串读取两个大数。首先需要把数组给初始化为0方便以后处理,然后对数组逆序对齐处理,接着相加转化后的两个数组并把之存进结果数组里面,最后对结果数组进行进位处理。

看代码吧。

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <algorithm>
#include <queue>
#include <stack>
#define LL long long
#define mem(a) memset(a,0,sizeof(a))
using namespace std;
char A[1005],B[1005];
int a[1005],b[1005],c[1005];
void nixu()
{
    mem(a);
    mem(b);
    mem(c);
    int k,len=0;
    k=strlen(A);
    for(int i=k-1;i>=0;i--)
        a[len++]=A[i]-‘0‘;
    k=strlen(B);
    len=0;
    for(int i=k-1;i>=0;i--)
        b[len++]=B[i]-‘0‘;
    return ;
}
void slove()
{
    int k;
    k=strlen(A)>strlen(B)?strlen(A):strlen(B);
    for(int i=0;i<k;i++)
        c[i]=a[i]+b[i];
    for(int i=0;i<k;i++)
    {
        if(c[i]>9)
        {
            c[i+1]+=c[i]/10;
            c[i]=c[i]%10;
        }
    }
}
int main()
{
    int T,flag,i=1;
    scanf("%d",&T);
    while(T--)
    {
        flag=0;
        scanf("%s%s",A,B);
        nixu();
        slove();
        printf("Case %d:\n%s + %s = ",i++,A,B);
        for(int i=1000;i>=0;i--)
        {
            if(c[i]!=0||flag==1)
            {
                printf("%d",c[i]);
                flag=1;
            }
        }
        printf("\n");
        if(T!=0)
            printf("\n");
    }
}

原文地址:https://www.cnblogs.com/zznu17-091041/p/8407773.html

时间: 2024-11-17 19:37:46

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