# Begin conf
VAR1 = VAL1
VAR2 = VAL2
# end

#include <fstream>
#include <iostream>
#include <string>

using namespace std;

int main()
{
  ifstream in ( "somefile" );

  if ( in.is_open() ) {
    string line;

    while ( getline ( in, line ) ) {
      string::size_type i = line.find_first_not_of ( " \t\n\v" );

      if ( i != string::npos && line[i] == '#' )
        continue;

      // Process non-comment line
    }
  }
}

#include <stdio.h>
#include <string.h>

int main ( void )
{
  FILE *in = fopen ( "somefile", "r" );

  if ( in != NULL ) {
    char line[1024];

    while ( fgets ( line, sizeof line, in ) != NULL ) {
      size_t i = strspn ( line, " \t\n\v" );

      if ( line[i] == '#' )
        continue;

      /* Process non-comment line */
    }
  }

  return 0;
}