데이터형 크기와 범위

데이터형                          키워드                   크기(바이트)          데이터 저장범위

문자                              char                             1                        -128 ~ 127

정수                               int                               2                     -32768 ~ 32767

Short형 정수                   short                            2                     -32768 ~ 32767

Long형 정수                   long                             4                     약 -21억 4천 7백만

                                                                                               ~21억 4천 7백만

부호없는문자                 unsigned char                1                         0 ~ 255

부호없는숫자                 unsigned int                   2                        0 ~ 65535  

부호없는Short형 정수      unsigned short               2                        0 ~ 65535

부호없는Long형 정수      unsigned long                4                   0 ~ 42억 9천 4백만

단정도부동소수점            float                             4                   1.2E-38 ~ 3.4E38

배정도부동소수점            double                         8                   2.2E-308 ~ 1.8E308

그러나 컴파일러마다 다르므로... 확인해 보는 것이 좋다