simgear/metar/Fracpart.cpp

   1 #include "Local.h"     /* standard header file */
   2 #include "Metar.h"
   3
   4 /********************************************************************/
   5 /*                                                                  */
   6 /*  Title:         fracPart                                         */
   7 /*  Organization:  W/OSO242 - GRAPHICS AND DISPLAY SECTION          */
   8 /*  Date:          13 Jun 1995                                      */
   9 /*  Programmer:    CARL MCCALLA                                     */
  10 /*  Language:      C/370                                            */
  11 /*                                                                  */
  12 /*  Abstract:      Convert a character string fraction into a       */
  13 /*                 decimal (floating point) number.                 */
  14 /*                                                                  */
  15 /*  External Functions Called:                                      */
  16 /*                 None.                                            */
  17 /*                                                                  */
  18 /*  Input:         string - a pointer to a character string frac-   */
  19 /*                          tion.                                   */
  20 /*  Output:        A decimal (floating point) number.               */
  21 /*                                                                  */
  22 /*  Modification History:                                           */
  23 /*                 None.                                            */
  24 /*                                                                  */
  25 /********************************************************************/
  26
  27 float fracPart( char *string )
  28 {
  29
  30    /***************************/
  31    /* DECLARE LOCAL VARIABLES */
  32    /***************************/
  33
  34    char buf[ 6 ],
  35         *slash;
  36
  37    float numerator,
  38          denominator;
  39
  40    /*************************/
  41    /* START BODY OF ROUTINE */
  42    /*************************/
  43
  44    slash = strchr(string, '/');
  45
  46    memset(buf , '\0', 6);
  47    strncpy( buf, string, slash-string);
  48
  49    numerator = (float) atoi(buf);
  50
  51    memset(buf , '\0', 6);
  52    strcpy( buf, slash+1);
  53
  54    denominator = (float) atoi(buf);
  55
  56    return (numerator/denominator);
  57
  58 }
  59