This is a set of common functions for string and number processing. 更多...

#include <math.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

str_num_common.c 的引用(Include)关系图:

函数
static int	format_string (char *str)
	This function examine whether a string represents a real number. 更多...

static double	str2num (char *number)
	This function transform a string consisting '1', '2', ..., and '.' into the real number that it represents. 更多...

详细描述

This is a set of common functions for string and number processing.

函数说明

◆ format_string()

static int format_string ( char * str )

static

This function examine whether a string represents a real number.

Transform the string represents a negtive number into a string represents a positive one and return its' sign. It returns 0 if the string do not represents a real number. After calling this function, there will be only one 'e' in the string, and the only position for '-' is behind 'e', and there can be only one dot in the string and the only position for it in before 'e'.

参数

[in] str String to be examined.

返回: The sign of the number represented by the string.

返回值

1	Positive number.
-1	Negative number.
0	Not a number.

弃用:: This function has been replaced by the variable 'errno' in the standard Library <errno.h>.

◆ str2num()

static double str2num ( char * number )

static

This function transform a string consisting '1', '2', ..., and '.' into the real number that it represents.

参数

[in] number String of the real number.

返回: The real number that the string represents.

弃用:: This function has been replaced by the 'strtod()' function in the standard Library <stdio.h>.

函数调用图:

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