//编写函数实现库函数atof
#include <stdio.h>
#include <assert.h>
#include <ctype.h>
#include <math.h>
double calculate(const char *src, int flag)
{
	double num = 0.0;
	int n = 0;
	int count = 0;
	while (*src)
	{
		if ((*src >= ‘0‘) && (*src <= ‘9‘))//推断输?入是否为?非数组字符
		{
			num = num * 10 + (*src - ‘0‘);
			src++;
			if (n)
			{
				count++;
			}
		}
		else if (*src =http://www.mamicode.com/= ‘.‘)"%f\n", str_to_int(" +23.45"));
	printf("%f\n", str_to_int(" -2.345"));
	printf("%f\n", str_to_int("+234.5"));
	printf("%f\n", str_to_int("-2345.44"));
	printf("%f\n", str_to_int("2345"));
	printf("%f\n", str_to_int("-1111.11"));
	printf("%f\n", str_to_int(""));
	printf("%f\n", str_to_int("123ab"));
	return 0;
}