POJ-2562（用例能过，但一直WA）

#include<iostream>#include<string>using namespace std;int stringAdd(string s1, string s2){int lenBig, lenSmall;if(s1.length()>s2.length()){lenBig=s1.length();lenSmall=s2.length();}else{lenBig=s2.length();lenSmall=s1.length();}int carryTime=0;int carryNum=0;for(int i=lenBig-1;i>=0;i--){int carry;if((lenBig-i)<=lenSmall){carry=(s1[i]+s2[i]-'0'-'0'+carryNum)/10;}else{if(s1.length()>s2.length()){carry=(s1[i]-'0'+carryNum)/10;}else{carry=(s2[i]-'0'+carryNum)/10;}if(carry<1){break;}}carryTime+=carry;carryNum=carry;}return carryTime;}int main(int argc, char *argv[]){string s1, s2;while(cin>>s1>>s2, s1!="0"||s2!="0"){int carryTime=stringAdd(s1,s2);if(carryTime==0){cout<<"No carry operation."<<endl;}else if(carryTime==1){cout<<carryTime<<" carry operation."<<endl;}else{cout<<carryTime<<" carry operations."<<endl;}}return 0;}