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#include <iostream>
#include <string>
#include <sstream>
using namespace std;
void cutstring(string & p,int &pos,double & opd1,double & opd2)
{
stringstream ss(p.substr(0,pos));
cout<<"\n this is just a debug information."
<<"\n to show the position of the iterator"
<<"\n the position is "<<pos<<"\n";
ss>>opd1;
cout<<"the opd1 is "<<opd1<<"\t";
stringstream xx(p.substr(pos+1,p.length()-pos));
xx>>opd2;
cout<<"the opd2 is "<<opd2<<'\n';
}
int main()
{
//my calculator
double opd1,opd2;
string uript;
int temp;
cout<<"input ur expression. (note if u input \"quit\", u will quit)"<<endl;
while (1)
{
temp=0;uript="";opd1=0;opd2=0;
cout<<"loop starts"<<endl;
cin>>uript;
if ((temp=uript.find_first_of('+',0))!=string::npos)
{
cout<<"\n !!!debug!!! iterator is "<<temp<<endl;
cout<<"u entered the + program\n";
cutstring(uript,temp,opd1,opd2);
cout<<"result\t"<<(opd1+opd2)<<endl;}
else if (temp=uript.find_first_of('-',0)!=string::npos)
{
cout<<"\n !!!debug!!! iterator is "<<temp<<endl;
cout<<"u entered the - program\n";
cutstring(uript,temp,opd1,opd2);
cout<<"result\t"<<(opd1-opd2)<<endl;}
else if (temp=uript.find_first_of('*',0)!=string::npos)
{
cout<<"\n !!!debug!!! iterator is "<<temp<<endl;
cout<<"u entered the * program\n";
cutstring(uript,temp,opd1,opd2);
cout<<"result\t"<<(opd1*opd2)<<endl;}
else if (temp=uript.find_first_of('/',0)!=string::npos)
{
cout<<"\n !!!debug!!! iterator is "<<temp<<endl;
cout<<"u entered the / program\n";
cutstring(uript,temp,opd1,opd2);
cout<<"result\t"<<(opd1/opd2)<<endl;}
else if (uript=="quit")
break;
else
{cout<<"ur input is not correct. please try again."; continue;}
}
cout<<endl<<"hope u have a nice day ^.^";
}
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