联想笔试真题

1.设计函数 int atoi(char *s)。



int atoi(char *s)



{



char sign;



char sign_val = 1;



int val = 0;



int n = 0;



/* skip spaces */



while (isspace(*s))



++s;



if (*s == ~-~ || *s == ~+~)



/* skip ~-~ and ~+~ sign */



{



sign = *s;



if (sign == ~-~)



sign_val = -1;



++s;



}



/* when goes here, it is not space or sign */



while ((*s != ~\0~) && isdigit(*s))



{



val = 10 * n + (*s - ~0~);



n = val;



s++;



}



if (*s != ~\0~)



{



printf("non digit in your input!!\n");



exit(-1);



}



/* non error occured */



return (sign_val * val);



}



2.int i=(j=4,k=8,l=16,m=32); printf("%d", i); 输出是多少?