simgear/metar/Fracpart.cpp

   1 #include "Local.h"     /* standard header file */
   2 #include "Metar.h"
   3
   4 #pragma subtitle(" ")
   5 #pragma page(1)
   6 #pragma subtitle("subtitle - description                       ")
   7 /********************************************************************/
   8 /*                                                                  */
   9 /*  Title:         fracPart                                         */
  10 /*  Organization:  W/OSO242 - GRAPHICS AND DISPLAY SECTION          */
  11 /*  Date:          13 Jun 1995                                      */
  12 /*  Programmer:    CARL MCCALLA                                     */
  13 /*  Language:      C/370                                            */
  14 /*                                                                  */
  15 /*  Abstract:      Convert a character string fraction into a       */
  16 /*                 decimal (floating point) number.                 */
  17 /*                                                                  */
  18 /*  External Functions Called:                                      */
  19 /*                 None.                                            */
  20 /*                                                                  */
  21 /*  Input:         string - a pointer to a character string frac-   */
  22 /*                          tion.                                   */
  23 /*  Output:        A decimal (floating point) number.               */
  24 /*                                                                  */
  25 /*  Modification History:                                           */
  26 /*                 None.                                            */
  27 /*                                                                  */
  28 /********************************************************************/
  29 #pragma page(1)
  30
  31 float fracPart( char *string )
  32 {
  33
  34    /***************************/
  35    /* DECLARE LOCAL VARIABLES */
  36    /***************************/
  37
  38    char buf[ 6 ],
  39         *slash;
  40
  41    float numerator,
  42          denominator;
  43
  44    /*************************/
  45    /* START BODY OF ROUTINE */
  46    /*************************/
  47
  48    slash = strchr(string, '/');
  49
  50    memset(buf , '\0', 6);
  51    strncpy( buf, string, slash-string);
  52
  53    numerator = (float) atoi(buf);
  54
  55    memset(buf , '\0', 6);
  56    strcpy( buf, slash+1);
  57
  58    denominator = (float) atoi(buf);
  59
  60    return (numerator/denominator);
  61
  62 }
  63