#include <stdio.h>

 int Myatoi(char*str){

     if (str == NULL){

         printf("Invalid Input");

         return -;

     }

     while (*str == ' '){

         str++;

     }

     while ((*str == (char)0xA1) && (*(str + ) == (char)0xA1)){

         str += ;

     }

     int nSign = (*str == '-') ? - : ;//确定符号位

     if (*str == '+' || *str == '-'){

         str++;

     }

     int nResult = ;

     while (*str >= ''&& *str <= ''){

         nResult = nResult *  + (*str - '');

         str++;

     }

     return nResult *nSign;

 }

 int main(){

     printf("%d\n", Myatoi(""));

     return ;

 }