Summing numbers from a file

Hello,
im trying to make a program that reads from a file and sums up only the numbers.the numbers ar aranged like this in the file:
100er34 67 yyy 7
5 63 6
1

My problem is that the program sums up wrong,it sums some numbers twice when it see space.its supposed to sum like this:100+34+67+7+5+63+6+1=283 But it sums like this 100 + 34 +4?+67+7+7?+5+5?+63+3?+6+1 =297. Those with ? is unwanted the. What kan i do?

Thanks

Code:

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//Oppgave 2 Øving 1
#include <iostream>
#include <fstream>
#include <cstring>
#include <cstdlib>
using namespace std;
/*
    oppgave2.txt contains
    100er34 67 yyy 7
    5 63 6
    1


*/

int main(){

    ifstream inputFile;
    char input[81];
    char input2[81];
    char input3[81];
    char test[] = "0123456789";
    char *ptr;
    int sum = 0;
    //cout<<"her";
    inputFile.open("oppgave2.txt");
    if(!inputFile){
        cout<<"File error\n";


    }
    else{
        //inputFile>>input;




        while(!inputFile.eof()){

            inputFile.getline(input,81);

            ptr = strpbrk (input, test);

        while(ptr != NULL ){

            cout<<*ptr<<" ";

            sum += atoi(ptr);
            cout<<"sum: "<<sum<<" ";


            ptr = strpbrk(ptr+1,test);


        }
    }
        cout<<"\n sum:"<<sum;

    }

    inputFile.close();

    return 0;
}

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