Iris-女王向前走

讀一個檔inf.txt將內文中的數字全部相加起來然後再將結果輸出至outf.txt

#include<iostream>
#include<fstream>
using namespace std;

int main()
{
    fstream qfile,afile;     //qfile演程式中的Qustion afile演程式的ansfile
    int theone=true;        //判斷是不是第一個數字
    char w;   //每get一個字元放在w中
    int n;  //算數字
    int tot=0;  //算加總
    qfile.open("inf.txt",ios::in);
    afile.open("outf.txt",ios::out);
    while(!qfile.eof())
    {
        n=0;
        do{
            qfile.get(w);
            if(w>='0' && w<='9')
            {
               n=n*10;
               n=n+(w-'0');
             }
        }while (w>='0' && w<='9') ;
           
    if(n!=0)
    {
            tot=tot+n;
            if (theone)
               theone=false;
            else
               {
                  cout<<'+';
                  afile<<'+';        
                }
                cout<<n;
                afile<<n;
               
            }   
                      
                       }
                       cout<<"="<<tot<<endl;
                       afile<<"="<<tot<<endl;
                       qfile.close();
                       afile.close();
                       system("pause");
    return 0;
}