icuSources/samples/numfmt/main.cpp

   1 /********************************************************************
   2  * COPYRIGHT:
   3  * Copyright (c) 1999-2014, International Business Machines Corporation and
   4  * others. All Rights Reserved.
   5  ********************************************************************/
   6
   7 #include "unicode/utypes.h"
   8 #include "unicode/unistr.h"
   9 #include "unicode/numfmt.h"
  10 #include "unicode/dcfmtsym.h"
  11 #include "unicode/decimfmt.h"
  12 #include "unicode/locid.h"
  13 #include "unicode/uclean.h"
  14 #include "util.h"
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18
  19 extern "C" void capi();
  20 void cppapi();
  21
  22 static void
  23 showCurrencyFormatting(UBool useICU26API);
  24
  25 int main(int argc, char **argv) {
  26     printf("%s output is in UTF-8\n", argv[0]);
  27
  28     printf("C++ API\n");
  29     cppapi();
  30
  31     printf("C API\n");
  32     capi();
  33
  34     showCurrencyFormatting(FALSE);
  35     showCurrencyFormatting(TRUE);
  36
  37     u_cleanup();    // Release any additional storage held by ICU.
  38
  39     printf("Exiting successfully\n");
  40     return 0;
  41 }
  42
  43 /**
  44  * Sample code for the C++ API to NumberFormat.
  45  */
  46 void cppapi() {
  47     Locale us("en", "US");
  48     UErrorCode status = U_ZERO_ERROR;
  49
  50     // Create a number formatter for the US locale
  51     NumberFormat *fmt = NumberFormat::createInstance(us, status);
  52     check(status, "NumberFormat::createInstance");
  53
  54     // Parse a string.  The string uses the digits '0' through '9'
  55     // and the decimal separator '.', standard in the US locale
  56     UnicodeString str("9876543210.123");
  57     Formattable result;
  58     fmt->parse(str, result, status);
  59     check(status, "NumberFormat::parse");
  60
  61     printf("NumberFormat::parse(\""); // Display the result
  62     uprintf(str);
  63     printf("\") => ");
  64     uprintf(formattableToString(result));
  65     printf("\n");
  66
  67     // Take the number parsed above, and use the formatter to
  68     // format it.
  69     str.remove(); // format() will APPEND to this string
  70     fmt->format(result, str, status);
  71     check(status, "NumberFormat::format");
  72
  73     printf("NumberFormat::format("); // Display the result
  74     uprintf(formattableToString(result));
  75     printf(") => \"");
  76     uprintf(str);
  77     printf("\"\n");
  78
  79     delete fmt; // Release the storage used by the formatter
  80
  81 }
  82
  83 // currency formatting ----------------------------------------------------- ***
  84
  85 /*
  86  * Set a currency on a NumberFormat with pre-ICU 2.6 APIs.
  87  * This is a "hack" that will not work properly for all cases because
  88  * only ICU 2.6 introduced a more complete framework and data for this.
  89  *
  90  * @param nf The NumberFormat on which to set the currency; takes effect on
  91  *           currency-formatting NumberFormat instances.
  92  *           This must actually be a DecimalFormat instance.
  93  *           The display style of the output is controlled by nf (its pattern,
  94  *           usually from the display locale ID used to create this instance)
  95  *           while the currency symbol and number of decimals are set for
  96  *           the currency.
  97  * @param currency The 3-letter ISO 4217 currency code, NUL-terminated.
  98  * @param errorCode ICU error code, must pass U_SUCCESS() on input.
  99  */
 100 static void
 101 setNumberFormatCurrency_2_4(NumberFormat &nf, const char *currency, UErrorCode &errorCode) {
 102     // argument checking
 103     if(U_FAILURE(errorCode)) {
 104         return;
 105     }
 106     if(currency==NULL || strlen(currency)!=3) {
 107         errorCode=U_ILLEGAL_ARGUMENT_ERROR;
 108         return;
 109     }
 110
 111     // check that the formatter is a DecimalFormat instance
 112     // necessary because we will cast to the DecimalFormat subclass to set
 113     // the currency symbol
 114     DecimalFormat *dnf=dynamic_cast<DecimalFormat *>(&nf);
 115     if(dnf==NULL) {
 116         errorCode=U_ILLEGAL_ARGUMENT_ERROR;
 117         return;
 118     }
 119
 120     // map the currency code to a locale ID
 121     // only the currencies in this array are supported
 122     // it would be possible to map to a locale ID, instantiate a currency
 123     // formatter for that and copy its values, but that would be slower,
 124     // and we have to hardcode something here anyway
 125     static const struct {
 126         // ISO currency ID
 127         const char *currency;
 128
 129         // fractionDigits==minimumFractionDigits==maximumFractionDigits
 130         // for these currencies
 131         int32_t fractionDigits;
 132
 133         /*
 134          * Set the rounding increment to 0 if it is implied with the number of
 135          * fraction digits. Setting an explicit rounding increment makes
 136          * number formatting slower.
 137          * In other words, set it to something other than 0 only for unusual
 138          * cases like "nickel rounding" (0.05) when the increment differs from
 139          * 10^(-maximumFractionDigits).
 140          */
 141         double roundingIncrement;
 142
 143         // Unicode string with the desired currency display symbol or name
 144         UChar symbol[16];
 145     } currencyMap[]={
 146         { "USD", 2, 0.0, { 0x24, 0 } },
 147         { "GBP", 2, 0.0, { 0xa3, 0 } },
 148         { "EUR", 2, 0.0, { 0x20ac, 0 } },
 149         { "JPY", 0, 0.0, { 0xa5, 0 } }
 150     };
 151
 152     int32_t i;
 153
 154     for(i=0; i<UPRV_LENGTHOF(currencyMap); ++i) {
 155         if(strcmp(currency, currencyMap[i].currency)==0) {
 156             break;
 157         }
 158     }
 159     if(i==UPRV_LENGTHOF(currencyMap)) {
 160         // a more specific error code would be useful in a real application
 161         errorCode=U_UNSUPPORTED_ERROR;
 162         return;
 163     }
 164
 165     // set the currency-related data into the caller's formatter
 166
 167     nf.setMinimumFractionDigits(currencyMap[i].fractionDigits);
 168     nf.setMaximumFractionDigits(currencyMap[i].fractionDigits);
 169
 170     dnf->setRoundingIncrement(currencyMap[i].roundingIncrement);
 171
 172     DecimalFormatSymbols symbols(*dnf->getDecimalFormatSymbols());
 173     symbols.setSymbol(DecimalFormatSymbols::kCurrencySymbol, currencyMap[i].symbol);
 174     dnf->setDecimalFormatSymbols(symbols); // do not adopt symbols: Jitterbug 2889
 175 }
 176
 177 /*
 178  * Set a currency on a NumberFormat with ICU 2.6 APIs.
 179  *
 180  * @param nf The NumberFormat on which to set the currency; takes effect on
 181  *           currency-formatting NumberFormat instances.
 182  *           The display style of the output is controlled by nf (its pattern,
 183  *           usually from the display locale ID used to create this instance)
 184  *           while the currency symbol and number of decimals are set for
 185  *           the currency.
 186  * @param currency The 3-letter ISO 4217 currency code, NUL-terminated.
 187  * @param errorCode ICU error code, must pass U_SUCCESS() on input.
 188  */
 189 static void
 190 setNumberFormatCurrency_2_6(NumberFormat &nf, const char *currency, UErrorCode &errorCode) {
 191     if(U_FAILURE(errorCode)) {
 192         return;
 193     }
 194     if(currency==NULL || strlen(currency)!=3) {
 195         errorCode=U_ILLEGAL_ARGUMENT_ERROR;
 196         return;
 197     }
 198
 199     // invariant-character conversion to UChars (see utypes.h and putil.h)
 200     UChar uCurrency[4];
 201     u_charsToUChars(currency, uCurrency, 4);
 202
 203     // set the currency
 204     // in ICU 3.0 this API (which was @draft ICU 2.6) gained a UErrorCode& argument
 205 #if (U_ICU_VERSION_MAJOR_NUM < 3)
 206     nf.setCurrency(uCurrency);
 207 #else
 208     nf.setCurrency(uCurrency, errorCode);
 209 #endif
 210 }
 211
 212 static const char *const
 213 sampleLocaleIDs[]={
 214     // use locale IDs complete with country code to be sure to
 215     // pick up number/currency format patterns
 216     "en_US", "en_GB", "de_DE", "ja_JP", "fr_FR", "hi_IN"
 217 };
 218
 219 static const char *const
 220 sampleCurrencies[]={
 221     "USD", "GBP", "EUR", "JPY"
 222 };
 223
 224 static void
 225 showCurrencyFormatting(UBool useICU26API) {
 226     NumberFormat *nf;
 227     int32_t i, j;
 228
 229     UnicodeString output;
 230
 231     UErrorCode errorCode;
 232
 233     // TODO: Using printf() here assumes that the runtime encoding is ASCII-friendly
 234     // and can therefore be mixed with UTF-8
 235
 236     for(i=0; i<UPRV_LENGTHOF(sampleLocaleIDs); ++i) {
 237         printf("show currency formatting (method for %s) in the locale \"%s\"\n",
 238                 useICU26API ? "ICU 2.6" : "before ICU 2.6",
 239                 sampleLocaleIDs[i]);
 240
 241         // get a currency formatter for this locale ID
 242         errorCode=U_ZERO_ERROR;
 243         nf=NumberFormat::createCurrencyInstance(sampleLocaleIDs[i], errorCode);
 244         if(U_FAILURE(errorCode)) {
 245             printf("NumberFormat::createCurrencyInstance(%s) failed - %s\n",
 246                     sampleLocaleIDs[i], u_errorName(errorCode));
 247             continue;
 248         }
 249
 250         for(j=0; j<UPRV_LENGTHOF(sampleCurrencies); ++j) {
 251             printf("  - format currency \"%s\": ", sampleCurrencies[j]);
 252
 253             // set the actual currency to be formatted
 254             if(useICU26API) {
 255                 setNumberFormatCurrency_2_6(*nf, sampleCurrencies[j], errorCode);
 256             } else {
 257                 setNumberFormatCurrency_2_4(*nf, sampleCurrencies[j], errorCode);
 258             }
 259             if(U_FAILURE(errorCode)) {
 260                 printf("setNumberFormatCurrency(%s) failed - %s\n",
 261                         sampleCurrencies[j], u_errorName(errorCode));
 262                 continue;
 263             }
 264
 265             // output=formatted currency value
 266             output.remove();
 267             nf->format(12345678.93, output);
 268             output+=(UChar)0x0a; // '\n'
 269             uprintf(output);
 270         }
 271     }
 272 }