类型 下限 上限

char CHAR_MIN CHAR_MAX

short SHRT_MIN SHRT_MAX

int INT_MIN INT_MAX

long LONG_MIN LONG_MAX

long long LLONG_MIN LLONG_MAX

无符号下限是0 UCHAR_MAX USHRT_MAX U INT_MAX ULONG_MAX ULLONG_MAX

例如 int number = INT_MAX ;

float.h头文件定义了表示浮点数的符号

类型 下限 上限

float FLT_MIN FLT_MAX

double DBL_MAX DBL_MAX

long double LDBL_MIN LDBL_MAX

例子：

/* Program 2.11 Finding the limits */

#include stdio.h /* For command line input and output */

#include limits.h /* For limits on integer types */

#include float.h /* For limits on floating-point types */

int main(void)

{

printf(Variables of type char store values from %d to %d,

CHAR_MIN, CHAR_MAX);

printf(\nVariables of type unsigned char store values from 0 to %u,

UCHAR_MAX);

printf(\nVariables of type short store values from %d to %d,

SHRT_MIN, SHRT_MAX);

printf(\nVariables of type unsigned short store values from 0 to %u,

USHRT_MAX);

printf(\nVariables of type int store values from %d to %d, INT_MIN, INT_MAX);

printf(\nVariables of type unsigned int store values from 0 to %u, UINT_MAX);

printf(\nVariables of type long store values from %ld to %ld,

LONG_MIN, LONG_MAX);

printf(\nVariables of type unsigned long store values from 0 to %lu,

ULONG_MAX);

printf(\nVariables of type long long store values from %lld to %lld,

LLONG_MIN, LLONG_MAX);

printf(\nVariables of type unsigned long long store values from 0 to %llu,

ULLONG_MAX);

printf(\n\nThe size of the smallest non-zero value of type float is %.3e,

FLT_MIN);

printf(\nThe size of the largest value of type float is %.3e, FLT_MAX);

printf(\nThe size of the smallest non-zero value of type double is %.3e,

DBL_MIN);

printf(\nThe size of the largest value of type double is %.3e, DBL_MAX);

printf(\nThe size of the smallest non-zero value of type long double is %.3Le,

LDBL_MIN);

printf(\nThe size of the largest value of type long double is %.3Le\n,

LDBL_MAX);

printf(\nVariables of type float provide %u decimal digits precision.,

FLT_DIG);

printf(\nVariables of type double provide %u decimal digits precision.,

DBL_DIG);

printf(\nVariables of type long double provide %u decimal digits precision.,

LDBL_DIG);

return 0;

}

摘自《C语言入门经典》第4版

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