【剑指offer】C语言：实现函数可以将一个字符串转换为对应的整数，如+1234输出1234

#include<stdio.h>

int my_atoi(char s[])     /*字符串转换函数*/
{
char* p = s;
int flag = 1;
int ret = 0;

if(*p=='-')
{
flag=-1;
}
if((*p=='+')||(*p=='-'))
{
p++;
}

while(*p!='\0')
{
if((*p>='0')&&(*p<='9'))
{
ret = 10*ret + *p -'0';
p++;
}
}
return flag*ret;
}

int main()
{
char s[5];
int  ret;
gets(s);
ret = my_atoi(s);
printf("%d",ret);
}