谁定义了C语言中整数类型的取值范围？

C语言中整数类型的取值范围是由标准库定义的。在头文件中有相应的宏定义，例如，<limits.h>中包含了整数类型的取值范围宏定义。代码示例如下：

#include <stdio.h>
#include <limits.h>

int main() {
    printf("signed char max value: %d\n", SCHAR_MAX);
    printf("signed char min value: %d\n", SCHAR_MIN);
    printf("unsigned char max value: %u\n", UCHAR_MAX);
    printf("short max value: %d\n", SHRT_MAX);
    printf("short min value: %d\n", SHRT_MIN);
    printf("unsigned short max value: %u\n", USHRT_MAX);
    printf("int max value: %d\n", INT_MAX);
    printf("int min value: %d\n", INT_MIN);
    printf("unsigned int max value: %u\n", UINT_MAX);
    printf("long max value: %ld\n", LONG_MAX);
    printf("long min value: %ld\n", LONG_MIN);
    printf("unsigned long max value: %lu\n", ULONG_MAX);

    return 0;
}

输出结果：

signed char max value: 127
signed char min value: -128
unsigned char max value: 255
short max value: 32767
short min value: -32768
unsigned short max value: 65535
int max value: 2147483647
int min value: -2147483648
unsigned int max value: 4294967295
long max value: 9223372036854775807
long min value: -9223372036854775808
unsigned long max value: 18446744073709551615