#include <stdio.h> #include <limits.h>int main(void) {puts("該環(huán)境下各字符型、整型數(shù)值的范圍");printf("char: :%d~%d\n", CHAR_MIN, CHAR_MAX);printf("signed char :%d~%d\n", SCHAR_MIN, SCHAR_MAX);printf("unsignd char :%d~%d\n", 0, UCHAR_MAX);printf("short :%d~%d\n", SHRT_MIN, SHRT_MAX);printf("int :%d~%d\n", INT_MIN, INT_MAX);printf("long :%ld~%ld\n", LONG_MIN, LONG_MAX);printf("unsigned short :%u~%u\n", 0, USHRT_MAX);printf("usigned :%u~%u\n", 0, UINT_MAX);printf("unsigned long :%lu~%lu\n", 0, ULONG_MAX);return 0; }

運行結(jié)果：

數(shù)據(jù)類型最小值最大值

char	-128	127
signed char	-128	127
unsignd char	0	255
short	-32768	32767
int	-2147483648	2147483647
long	-2147483648	2147483647
unsigned short	0	65535
usigned	0	4294967295
unsigned long	0	4294967295

聲明變量時，可以通過加上 類型說明符 signed 或 unsigned 來指定其中一種數(shù)據(jù)類型。若不加類型說明符，則默認(rèn)為有符號。

無符號整型 （unsigned integer type） 表示 0 和整數(shù)的整型
有符號整型 （signed integer type） 表示 0 和正負(fù)數(shù)的整型

字符型整型有符號整型無符號整型

signed char	signed short int	signed char	unsigned char
char	signed int	signed short int	unsigned short int
unsigned char	signed long int	signed int	unsigned int
	unsigned short int	signed long int	unsigned long int
	unsigned int
	unsigned long int
	signed short
	signed int
	short
	unsigned short
	signed
	int
	unsigned
	signed long
	long int
	long
	unsigned long

注：char 型比較特殊，存在既不帶 signed 又不帶 unsigned 的 “單獨”的char型。
對于單獨的 short 和 long, 可以認(rèn)為是省略了 int。
對于單獨的 signed 和 unsigned,可以認(rèn)為是（非 short 和 long 的）int。

總結(jié)

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