ICU-22900 Remove deprecated SimpleNumber truncateStart

See unicode-org#3192

Author: sffc

icu4c/source/i18n/number_capi.cpp

@@ -317,11 +317,6 @@ usnum_setMaximumIntegerDigits(USimpleNumber* unumber, int32_t maximumIntegerDigi
     number->fNumber.setMaximumIntegerDigits(maximumIntegerDigits, *ec);
 }
 
-U_CAPI void U_EXPORT2
-usnum_truncateStart(USimpleNumber* unumber, int32_t maximumIntegerDigits, UErrorCode* ec) {
-    usnum_setMaximumIntegerDigits(unumber, maximumIntegerDigits, ec);
-}
-
 U_CAPI void U_EXPORT2
 usnum_setSign(USimpleNumber* unumber, USimpleNumberSign sign, UErrorCode* ec) {
     auto* number = USimpleNumberData::validate(unumber, *ec);

icu4c/source/i18n/number_simple.cpp

@@ -108,10 +108,6 @@ void SimpleNumber::setMaximumIntegerDigits(uint32_t position, UErrorCode& status
     fData->quantity.applyMaxInteger(position);
 }
 
-void SimpleNumber::truncateStart(uint32_t position, UErrorCode& status) {
-    setMaximumIntegerDigits(position, status);
-}
-
 void SimpleNumber::setSign(USimpleNumberSign sign, UErrorCode& status) {
     if (U_FAILURE(status)) {
         return;

icu4c/source/i18n/unicode/simplenumberformatter.h

@@ -87,16 +87,6 @@ class U_I18N_API SimpleNumber : public UMemory {
     void setMaximumIntegerDigits(uint32_t maximumIntegerDigits, UErrorCode& status);
 #endif // U_HIDE_DRAFT_API
 
-#ifndef U_HIDE_DEPRECATED_API
-    /**
-     * Alias for setMaximumIntegerDigits.
-     * Will be removed after ICU 75.
-     *
-     * @deprecated ICU 75
-     */
-    void truncateStart(uint32_t maximumIntegerDigits, UErrorCode& status);
-#endif // U_HIDE_DEPRECATED_API
-
     /**
      * Pads the beginning of the number with zeros up to the given minimum number of integer digits.
      *

icu4c/source/i18n/unicode/usimplenumberformatter.h

@@ -167,18 +167,6 @@ usnum_setMaximumIntegerDigits(USimpleNumber* unumber, int32_t maximumIntegerDigi
 #endif // U_HIDE_DRAFT_API
 
 
-#ifndef U_HIDE_DEPRECATED_API
-/**
- * Alias for setMaximumIntegerDigits.
- * Will be removed after ICU 75.
- *
- * @deprecated ICU 75
- */
-U_CAPI void U_EXPORT2
-usnum_truncateStart(USimpleNumber* unumber, int32_t maximumIntegerDigits, UErrorCode* ec);
-#endif  // U_HIDE_DEPRECATED_API
-
-
 /**
  * Sets the sign of the number: an explicit plus sign, explicit minus sign, or no sign.
  *