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Simple c++ exercise to split a string into fields.
The program scans a text file. If a line contains field 1 = filed 2, the fields are extracted into to two fields. From each field spaces are removed (rm_spaces).
More c++ examples at: c++ page

  1. #include <iostream>
  2. #include <fstream>
  3. #include <string>
  5. using namespace std;
  7. void rm_spaces(string& st) {
  8.   size_t next;
  9.   next = st.find_first_of( " ", 0 );
  10.   while(next != string::npos) {
  11.     st=st.substr(0, next) + st.substr(next+1);
  12.     next = st.find_first_of( " ", 0 );
  13.   }
  14. }



  16. int main ()
  17. {
  18.   string st, sr, su;
  19.   fstream infile;
  20.   size_t next;
  23.   infile.open ("Diversity_20_Receiver_Init_Val", ios::in);
  24.   while(getline(infile,st))
  25.   {
  26.     //split based on if if found
  27.     getline(infile,st);
  28.     next = st.find_first_of( "=", 0 );
  29.     if(next != string::npos) {
  30.       sr=st.substr(0, next++);
  31.       rm_spaces(sr);
  32.       su=st.substr(next);
  33.       rm_spaces(su);
  34.       cout << st << endl;
  35.       cout << sr << endl;
  36.       cout << su << endl;
  37.       cout << next << endl;
  38.     }
  39.   }
  40.   infile.close();
  41. }
  ...


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