C库 - <float.h> C库宏 - errno C库 - <limits.h> C库 - <float.h> #include <stdio.h> #include <float.h> int main () { printf("The maximum value of float = %.10e\n", FLT_MAX); printf("The minimum value of float = %.10e\n", FLT_MIN); printf("The number of digits in the number = %.10e\n", FLT_MANT_DIG); } C库宏 - errno C库 - <limits.h>