关于Android C代码 变量拆分组合的有关问题

//方法1 unsigned int HIGH_INT(unsigned long long d){     unsigned long long dcopy = d;     return ((unsigned int*)&dcopy)[1];}  unsigned long long MAKE_DBLINT(unsigned int high, unsigned int low){     unsigned long long build = low;     ((unsigned int*)&build)[1] = high;     return build;}  void printInt(unsigned long long l) {     unsigned int high = HIGH_INT(l),low = (unsigned int)l;     LOGV("high=%X low=%X",high,low); }//方法2 unsigned int HIGH_INT2(unsigned long long d) {               unsigned long long dcopy = d;      return (unsigned int)(dcopy>>32); }  unsigned long long MAKE_DBLINT2(unsigned int high, unsigned int low) {      unsigned long long build = low;      unsigned long long build2 = high;      build2 = build2 << 32;      build = build | build2;               return build; }  void printInt2(unsigned long long l) {      unsigned int high = HIGH_INT2(l),low = (unsigned int)l;      LOGV("high=%X low=%X",high,low); } JNIEXPORT void JNICALL Java_com_arcsoft_drmtest_Native_Test(JNIEnv *, jobject) {     unsigned int h = 0x10245670;     unsigned int l = 0x89ABCDEF;     printInt(MAKE_DBLINT(h,l));     printInt2(MAKE_DBLINT2(h,l));}