hdu1002

hdu1002 高精度加法水题一道

#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#include <map>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <vector>
#include <stack>
#include <cstdlib>
#include <queue>
#include <set>
#include <cctype>
using namespace std;
#define  loop(i,u,v) for(int i = u;i <= v;i++)
#define rloop(i,u,v) for(int i = u;i >= v;i--)
#define eps  0.00000001

void reverse(char *a)
{
    char *first = &a[0];
    char *last = &a[strlen(a)-1];
    for(;first < last ; first++,last--)
    {
        char x = *first;
        *first = *last;
        *last = x;
    }
}

int main()
{
    string a,b,c,d;
    int num[1100];
    int n;

    cin >> n;
    loop(i,1,n)
    {
        memset(num,0,sizeof(num));
        cin >> a >> b;
        c = a;
        d = b;
        reverse(&a[0]);
        reverse(&b[0]);

        int la = a.size();
        int lb = b.size();
        int lmin = min(la,lb);
        int lmax = max(la,lb);
        int x = 0;
        int last = lmin - 1;
        if(lb > la)
            swap(a,b);

        loop(j,0,last)
        {
            num[j] += (int)a[j] + (int)b[j] - '0' - '0';
            if(num[j] >= 10)
            {
                num[j+1] = 1;
                num[j] -= 10;
            }
        }
        loop(j,lmin,lmax-1)
            num[j] += (int)a[j] - '0';
            if(num[lmax] > 9)
            {
                num[lmax+1] = 1;
                num[lmax] -= 10;
                lmax++;
            }
            else if(num[lmax])
                lmax++;

        printf("Case %d:\n",i );
        printf("%s + %s = ",&c[0],&d[0] );
        rloop(j,lmax-1,0)
            cout << num[j];
        cout << endl;
        if(i < n)
            cout << endl;
    }

    return 0;
}