c++ - How to read integers from a text file containing symbols, numbers and maybe alphabets? -

how read integers following text file containing symbols, numbers , maybe alphabets?

i have following text file

@ 100:20 ; 20:40 ; #  @ 50:30 ; #  @ 10:21:37 ; 51:23 ; 22:44 ; # 

i have tried following codes :

int main() {     std::ifstream myfile("10.txt", std::ios_base::in);      int a;     while (myfile >> a)     {        std::cout<< a;     }      return 0; } 

and

void main() {    std::ifstream myfile("10.txt", std::ios_base::in);    std::string line;     while (std::getline(infile, line))    {        std::istringstream iss(line);        int n;        while (iss >> n)        {          std::cout << n ;        }      } } 

all garbage value of int variable (or initial value if initialize )

how solve this?

you can try splitting each line separate tokens delimited colon character:

int main() {     std::ifstream myfile("10.txt", std::ios_base::in);     std::string line;      while (std::getline(myfile, line))     {         std::istringstream iss(line);         std::string token;         while (std::getline(iss, token, ':'))         {             std::istringstream tss(token);             int n;             while (tss >> n)             {                 std::cout << n << std::endl;             }         }     }      return 0; } 

this should print:

100 20 20 40 50 30 10 21 37 51 23 22 44 

as per comment, recommend more robust parsing algorithm respects unique structure of files.