icuSources/samples/numfmt/capi.c

   1 /********************************************************************
   2  *   © 2016 and later: Unicode, Inc. and others.
   3  *   License & terms of use: http://www.unicode.org/copyright.html#License
   4  *************************************************************************
   5  *************************************************************************
   6  * COPYRIGHT:
   7  * Copyright (c) 1999-2002, International Business Machines Corporation and
   8  * others. All Rights Reserved.
   9  *************************************************************************/
  10
  11 #include "unicode/unum.h"
  12 #include "unicode/ustring.h"
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15
  16 static void uprintf(const UChar* str) {
  17     char buf[256];
  18     u_austrcpy(buf, str);
  19     printf("%s", buf);
  20 }
  21
  22 void capi() {
  23     UNumberFormat *fmt;
  24     UErrorCode status = U_ZERO_ERROR;
  25     /* The string "987654321.123" as UChars */
  26     UChar str[] = { 0x39, 0x38, 0x37, 0x36, 0x35, 0x34, 0x33,
  27                     0x32, 0x31, 0x30, 0x2E, 0x31, 0x32, 0x33, 0 };
  28     UChar buf[256];
  29     int32_t needed;
  30     double a;
  31
  32     /* Create a formatter for the US locale */
  33     fmt = unum_open(
  34           UNUM_DECIMAL,      /* style         */
  35           0,                 /* pattern       */
  36           0,                 /* patternLength */
  37           "en_US",           /* locale        */
  38           0,                 /* parseErr      */
  39           &status);
  40     if (U_FAILURE(status)) {
  41         printf("FAIL: unum_open\n");
  42         exit(1);
  43     }
  44
  45     /* Use the formatter to parse a number.  When using the C API,
  46        we have to specify whether we want a double or a long in advance.
  47
  48        We pass in NULL for the position pointer in order to get the
  49        default behavior which is to parse from the start. */
  50     a = unum_parseDouble(fmt, str, u_strlen(str), NULL, &status);
  51     if (U_FAILURE(status)) {
  52         printf("FAIL: unum_parseDouble\n");
  53         exit(1);
  54     }
  55
  56     /* Show the result */
  57     printf("unum_parseDouble(\"");
  58     uprintf(str);
  59     printf("\") => %g\n", a);
  60
  61     /* Use the formatter to format the same number back into a string
  62        in the US locale.  The return value is the buffer size needed.
  63        We're pretty sure we have enough space, but in a production
  64        application one would check this value.
  65
  66        We pass in NULL for the UFieldPosition pointer because we don't
  67        care to receive that data. */
  68     needed = unum_formatDouble(fmt, a, buf, 256, NULL, &status);
  69     if (U_FAILURE(status)) {
  70         printf("FAIL: format_parseDouble\n");
  71         exit(1);
  72     }
  73
  74     /* Show the result */
  75     printf("unum_formatDouble(%g) => \"", a);
  76     uprintf(buf);
  77     printf("\"\n");
  78
  79     /* Release the storage used by the formatter */
  80     unum_close(fmt);
  81 }