3054 高精度练习-文件操作

#include<cstdio>
#include<iostream>
#include<cstring>
#define ref(i,x,y)for(int i=x;i<=y;i++)
#define def(i,x,y)for(int i=x;i>=y;i--)
using namespace std;
int lena,lenb,lenc,p,t,a[1010],b[1010],c[1010];
char a1[1010];
bool flag=0;
int main()
{
    scanf("%d",&t);
    while(t--){
    memset(a1,0,sizeof a1);
    memset(a,0,sizeof a);
    memset(b,0,sizeof b);
    memset(c,0,sizeof c);    
    scanf("%s",a1);
    lena=strlen(a1);lenb=1;
    lenc=max(lena,lenb);b[1]=1;
    if(a1[0]==‘-‘&&a1[1]==‘1‘&&a1[2]==‘\0‘){printf("0 ");continue;}
    if(a1[0]==‘-‘){
        flag=1;
        def(i,lena-1,1) a[++p]=a1[i]-48;
        lena--;p=0;
    }
    else
       ref(i,0,lena-1) a[lena-i]=a1[i]-48;
    if(!flag){
       ref(i,1,lenc){
           c[i]+=a[i]+b[i];
           c[i+1]+=c[i]/10;
           c[i]%=10;
       }
       int j=lenc+1;
       while(c[j]==0&&j>1) j--;
       def(i,j,1) printf("%d",c[i]);
       printf(" ");
    }
    else{
        printf("-");flag=0;
        ref(i,1,lena){
            if(a[i]<b[i]){
                a[i+1]--;a[i]+=10;
            }
            c[i]=a[i]-b[i];
        }
        int j=lena+1;
        while(c[j]==0&&j>1) j--;
        def(i,j,1) printf("%d",c[i]);
        printf(" ");
        }
    }
    return 0;
}