hdu1047(模拟大数循环相加)

题目信息:多个大整数相加求和，(用add函数循环相加)

http://acm.hdu.edu.cn/showproblem.php?pid=1047

AC代码:

/** ?*大数的循环加法,转化为字符串循环相加到字符串为"0" ?*注意s=="0"的情况,输出数据之间有空格 ?*/ #include<iostream> #include<string> #include<cstdio> using namespace std; string add(string s1,string s2){//字符串模拟大数加法,??? string s; ??? int len1,len2; ??? len1=s1.size()-1; len2=s2.size()-1; ??? int i=0,flag=0; ??? while(len1>-1&&len2>-1){ ??????? int sum=flag+(s1[len1--]-'0')+(s2[len2--]-'0'); ??????? s+=char ((sum)%10+'0'); ??????? flag=sum/10; ??? } ??? while(len1>-1){ ??????? int sum=flag+(s1[len1--]-'0'); ??????? s+=char ((sum)%10+'0'); ??????? flag=sum/10; ??? } ??? while(len2>-1){ ??????? int sum=flag+(s2[len2--]-'0'); ??????? s+=char ((sum)%10+'0'); ??????? flag=sum/10; ??? } ??? if(flag) s+=char ('0'+flag); ??? //cout<<s<<endl; ??? for(int i=0;i<s.size()/2;i++){ ??????? char c=s[i]; ??????? s[i]=s[s.size()-i-1]; ??????? s[s.size()-i-1]=c; ??? } ??? return s; } int main() { ??? int t; ??? cin>>t; ??? while(t--){ ??????? string s,s1; ??????? cin>>s; ??????? if(s=="0"){//只有一个0的情况 ??????????? cout<<"0"<<endl; ??????? } ??????? else{ ??????????? cin>>s1; ??????????? for(int i=1;s1!="0";i++){ ??????????????? s=add(s,s1); ??????????????? cin>>s1; ??????????? } ??????????? //cout<<s<<endl; ??????????? int k; ??????????? for(k=0;k<s.size();k++){ ??????????????? if(s[k]!='0') break; ??????????? } ??????????? if(k==s.size()) cout<<"0";//全是0 ??????????? for(int i=k;i<s.size();i++){ ??????????????? cout<<s[i]; ??????????? } ??????????? cout<<endl; ??????? } ??????? if(t) cout<<endl;//每次输出有一个空格 ??? } ??? return 0; }