txt中读到非数字时显示行列号

txt中读出非数字的行列号程序如下
当读到非数字时显示其行列号，改了好久都是错的，大家帮我看看吧


#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
#include<ctype.h>
#include <stdlib.h>
using namespace std;
inline void makeitem(vector<int>& item,istringstream &in );
int main()
{
    string line;
    ifstream f("D:\\VS2012\\CPP\\txt1\\abc.txt");
    if(!f.is_open())
    {
        cout<<"error openfile"<<endl;return 1;
    }
    vector<int> item;
    vector<vector<int> > arr;
    int num=0;
    while(!f.eof())
    {
        int num=0;
        getline(f,line);
        if(line.empty())continue;
        istringstream input(line);
        item.clear();
        while(!input.eof())
        {
            input>>num;
            item.push_back(num);
        }
        arr.push_back(item);
    }
    f.close();
    //output arr
    for (int i=0;i<arr.size();i++)
    {   
        item=arr[i];
   
        for (int j=0;j<item.size();j++)
        {
         
            cout<<item[j]<<" ";
        
        }
   
        cout<<endl;
    }
    int max[]={0};
    for(int i=0;i<arr.size();i++)
    {
        for(int j=0;j<item.size();j++)
        {
            if(arr[i][j]>max[i])
            {
                max[i]=arr[i][j];
            }
        }
    cout<<max[i]<<" ";
    cout<<endl;
    }
    getchar();
}