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  1. #include <cstdio>
  2. #include <cstring>
  3. using namespace std;
  4.  
  5. void print_as16(unsigned utf32) {
  6.     if ( utf32 < 0x10000 )
  7. 		printf("\\u%04X", utf32);
  8. 	else {
  9. 		unsigned wwwww = (utf32 >> 16) - 1;
  10. 		unsigned x1 = (utf32 >> 10) & 0x3F;
  11. 		unsigned x2 = (utf32 >> 0) & 0x03FF;
  12. 		unsigned utf16_1 = 0xD800 | (wwwww << 6) | x1;
  13. 		unsigned utf16_2 = 0xDC00 | x2;
  14. 		printf("\\u%02X\\u", utf16_1, utf16_1);
  15. 	}
  16. }
  17.  
  18. int main() {
  19. 	char const *p_org="\xE3\x81\xBE\xE3\x82\x93\xE3\x81\x93z"; // UTF-8文字列。
  20.  
  21. 	for ( auto i = 0; i < strlen(p_org); i++ ) 	{
  22. 		if ( (p_org[i] & 0x80) == 0 )
  23. 			printf("%c", p_org[i]);
  24. 		else if ( (p_org[i] & 0xE0) == 0xC0 ) {
  25. 			unsigned yyyyy = p_org[i] & 0x1F;
  26. 			unsigned xxxxxx = p_org[++i] & 0x3F;
  27. 			unsigned utf32 = (yyyyy<<6) | xxxxxx;
  28. 			print_as16(utf32);
  29. 		}
  30. 		else if ( (p_org[i] & 0xF0) == 0xE0 ) {
  31. 			unsigned zzzz = p_org[i] & 0x0F;
  32. 			unsigned yyyyyy = p_org[++i] & 0x3F;
  33. 			unsigned xxxxxx = p_org[++i] & 0x3F;
  34. 			unsigned utf32 = (zzzz<<12) | (yyyyyy<<6) | xxxxxx;
  35. 			print_as16(utf32);
  36. 		}
  37. 		else if ( (p_org[i] & 0xF0) == 0xF0 ) ; // 4バイトは省略
  38. 	}
  39.  
  40. 	getchar();
  41. }
  42.  
Success #stdin #stdout 0s 2856KB
comments (?)
stdin
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Standard input is empty
stdout
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\u307E\u3093\u3053z
https://ideone.com/2StvbL
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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