#include<iostream>#include<string>#include<algorithm>using namespace std;#define n 10string dezero(string a)//用來去掉正數前面的0，也就是說可以輸入000001類似這樣的數字{ long int i; for(i=0;i<a.length();i++) { if(a.at(i)>48) break; } if(i==a.length()) return "0"; a.erase(0,i); return a;}int judge(string a,string b)//判斷兩個正數的大小{ if(a.length()>b.length()) return 1; if(a.length()<b.length()) return -1; long int i; for(i=0;i<a.length();i++) { if(a.at(i)>b.at(i)) return 1; if(a.at(i)<b.at(i)) return -1; } return 0;}string minus(string a,string b)//自然數減法{ a=dezero(a); b=dezero(b); long int i,j=0; string c="0"; string c1,c2; string d="-"; if(judge(a,b)==0) return c; if(judge(a,b)==1) { c1=a; c2=b; } if(judge(a,b)==-1) { c1=b; c2=a; j=-1; } reverse(c1.begin(),c1.end()); reverse(c2.begin(),c2.end()); for(i=0;i<c2.length();i++) { if(c2.at(i)>=48&&c2.at(i)<=57) c2.at(i)-=48; if(c2.at(i)>=97&&c2.at(i)<=122) c2.at(i)-=87; } for(i=0;i<c1.length();i++) { if(c1.at(i)>=48&&c1.at(i)<=57) c1.at(i)-=48; if(c1.at(i)>=97&&c1.at(i)<=122) c1.at(i)-=87; } for(i=0;i<c2.length();i++) { c1.at(i)=c1.at(i)-c2.at(i); } for(i=0;i<c1.length()-1;i++) { if(c1.at(i)<0) {  c1.at(i)+=n;  c1.at(i+1)--; } } for(i=c1.length()-1;i>=0;i--) { if(c1.at(i)>0) break; } c1.erase(i+1,c1.length()); for(i=0;i<c1.length();i++) { if(c1.at(i)>=10) c1.at(i)+=87; if(c1.at(i)<10) c1.at(i)+=48; } reverse(c1.begin(),c1.end()); if(j==-1) c1.insert(0,d); return c1;}int main(){ string a,b; while(cout<<"input:"&&cin>>a>>b) { cout<<"output:"<<minus(a,b)<<endl; } return 0;}