unsigned int ui = 3000000000U 에서,
뒤에 U를 붙이는 이유는 무엇인가요?&nbsp;
다른 자료형들도 전부 char이면 c, short면 s를 붙이나요?

안녕하세요 :)
이는 3000000000이 Unsigned 상수임을 나타내는 접미사입니다.
<table style="max-width: 100%; background-color: #ffffff; border-collapse: collapse; border-spacing: 0px; color: #525252; margin-top: 10px; border: 1px solid #000000; font-family: Arial, Helvetica, sans-serif; font-size: 14px;">
<thead style="background-color: #acacac; color: #ffffff;">
<tr>
<th style="border: 1px solid #000000; padding: 0.2rem 0.5rem;">접미사</th>
<th style="border: 1px solid #000000; padding: 0.2rem 0.5rem;">자료형</th>
</tr>
</thead>
<tbody>
<tr>
<td style="min-width: 16px; border: 1px solid #000000; padding: 0.2rem 0.5rem;">생략</td>
<td style="border: 1px solid #000000; padding: 0.2rem 0.5rem;">int</td>
</tr>
<tr>
<td style="min-width: 16px; border: 1px solid #000000; padding: 0.2rem 0.5rem;">l, L</td>
<td style="border: 1px solid #000000; padding: 0.2rem 0.5rem;">long</td>
</tr>
<tr>
<td style="min-width: 16px; border: 1px solid #000000; padding: 0.2rem 0.5rem;">u, U</td>
<td style="border: 1px solid #000000; padding: 0.2rem 0.5rem;">unsigned int</td>
</tr>
<tr>
<td style="min-width: 16px; border: 1px solid #000000; padding: 0.2rem 0.5rem;">ul, UL</td>
<td style="border: 1px solid #000000; padding: 0.2rem 0.5rem;">unsigned long</td>
</tr>
<tr>
<td style="min-width: 16px; border: 1px solid #000000; padding: 0.2rem 0.5rem;">ll, LL</td>
<td style="border: 1px solid #000000; padding: 0.2rem 0.5rem;">long long</td>
</tr>
<tr>
<td style="min-width: 16px; border: 1px solid #000000; padding: 0.2rem 0.5rem;">ull, ULL</td>
<td style="border: 1px solid #000000; padding: 0.2rem 0.5rem;">unsigned long long</td>
</tr>
</tbody>
</table>
자세한 내용은 <a href="https://dojang.io/mod/page/view.php?id=71">이 링크</a>를 참고해보세요.
감사합니다.

접미사	자료형
생략	int
l, L	long
u, U	unsigned int
ul, UL	unsigned long
ll, LL	long long
ull, ULL	unsigned long long

인프런 커뮤니티 질문&답변

unsigned int ui = 3000000000U 에서