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C标准库--类型限制＜limits.h＞

news 2025/10/18 12:56:25

简介

limits.h 头文件决定了各种变量类型的各种属性。定义在该头文件中的宏限制了各种变量类型（比如 char、int 和 long）的值。
这些限制指定了变量不能存储任何超出这些限制的值，例如一个无符号可以存储的最大值是 255。

库宏

下面的值是特定实现的，且是通过 #define 指令来定义的，这些值都不得低于下边所给出的值。
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实例

下面的实例演示了 limit.h 文件中定义的一些常量的使用。

		#include <stdio.h>#include <limits.h>int main(){printf("The number of bits in a byte %d\n", CHAR_BIT);printf("The minimum value of SIGNED CHAR = %d\n", SCHAR_MIN);printf("The maximum value of SIGNED CHAR = %d\n", SCHAR_MAX);printf("The maximum value of UNSIGNED CHAR = %d\n", UCHAR_MAX);printf("The minimum value of SHORT INT = %d\n", SHRT_MIN);printf("The maximum value of SHORT INT = %d\n", SHRT_MAX); printf("The minimum value of INT = %d\n", INT_MIN);printf("The maximum value of INT = %d\n", INT_MAX);printf("The minimum value of CHAR = %d\n", CHAR_MIN);printf("The maximum value of CHAR = %d\n", CHAR_MAX);printf("The minimum value of LONG = %ld\n", LONG_MIN);printf("The maximum value of LONG = %ld\n", LONG_MAX);return(0);}结果：The number of bits in a byte 8The minimum value of SIGNED CHAR = -128The maximum value of SIGNED CHAR = 127The maximum value of UNSIGNED CHAR = 255The minimum value of SHORT INT = -32768The maximum value of SHORT INT = 32767The minimum value of INT = -32768The maximum value of INT = 32767The minimum value of CHAR = -128The maximum value of CHAR = 127The minimum value of LONG = -2147483648The maximum value of LONG = 2147483647