挂一波Dalao的代码

#include<iostream>#include<cstdio>#include<cstring>#include<string>using namespace std;#define max(a,b) (a>b?a:b)int main() {    string str1,str2;    int len1,len2;    cin>>str1>>str2;    len1=str1.size();    len2=str2.size();    for (register int i=0;i<len1;++i) {        a[i]=str1[len1-i-1];    }    for (register int i=0;i<len2;++i) {        b[i]=str2[len2-i-1];    }    len3=max(len1,len2);    for (register int i=0;i<len3;++i) {        a[i]=(a[i]+b[i])%10;        a[i+1]+=(a[i]+b[i])/10;    }    int i;    for (i=len3;(i>0)&&!a[i];--i);    for (;i>=0;--i) {        printf("%d",a[i]);    }    return 0;}

大佬代码
然而有bug