编程实现atoi函数

#include <stdio.h>  #include <string.h>    #define MAX_SIZE 100    int my_atoi(char *src)  {      int flag = 1;            int result = 0;            if(*src == '-')      {          flag = -1;      src++;      }       while(*src != '\0')      {          if(*src >= '0' && *src <= '9')      {          result = result * 10 + (*src - '0');      }      else      {          break;      }            src++;      }       return result * flag;  }    int main()  {      int i;      int len;      int result = 0;           char src[MAX_SIZE] = {0};        printf("Please input string:\n");      gets(src);            result = my_atoi(src);        printf("result = %d\n",result);        return 0;  }