http://acm.hdu.

#include <stdio.h>
#include <string.h>

int main()
{
    int i,n,j,t,xt,zt;
    char z[10000],x[10000],v[10000]={0};
    char a;
    scanf("%d",&n);
    j=1;
    while(n--)
    {
        scanf("%s%s",z,x);
        zt=strlen(z);
        xt=strlen(x);
        printf("Case %d:\n",j++);
        printf("%s + %s = ",z,x);
        for(i=0;i<zt/2;i++){a=z[i];z[i]=z[zt-1-i];z[zt-1-i]=a;}
        for(i=0;i<xt/2;i++){a=x[i];x[i]=x[xt-1-i];x[xt-1-i]=a;}
        for(i=0;i<zt;i++){z[i]-='0';}
        for(i=0;i<xt;i++){x[i]-='0';}
        if(zt>xt)
            t=zt;
        else
            t=xt;
        for(i=0;i<t;i++)
        {
            v[i]+=z[i]+x[i];
            if(v[i]>=10)
            {v[i]=v[i]%10;v[i+1]++;}
        }
        if(v[t]!=0)
            {t=t+1;}
        for(i=t-1;i>=0;i--)
           { printf("%d",v[i]);v[i]=0;}
        printf("\n");
    }
    return 0;
}

谢谢