1 #include<stdio.h>
2 int str_to_int(const char *str,int *num);
3 void int_to_str(char str[],const int strLen,const int num);
4
5 int main(int argc,char *argv[])
6 {
7 char str[16];
8 int ret = 0,n = 0;
9 while(1)
10 {
11 scanf("%s",str);
12 ret = str_to_int(str,&n);
13 if(ret == 0)
14 {
15 printf("%d\n",n);
16 int_to_str(str,16,n);
17 printf("%s\n",str);
18 }
19 else
20 {
21 printf("error\n");
22 }
23 }
24 return 0;
25 }
26
27 int str_to_int(const char *str,int *num)
28 {
29 int sign = 1;
30 *num = 0;
31 const char *p = str;
32 while(*p != '\0')
33 {
34 if( *p >= '0' && *p <= '9' )
35 {
36 *num = *num * 10 + *p - '0';
37 p++;
38 }
39 else if( *p == '-' && *num == 0)
40 {
41 sign = -1;
42 p++;
43 }
44 else
45 {
46 return -1;
47 }
48 }
49 *num *= sign;
50 return 0;
51 }
52
53 void int_to_str(char str[],const int strLen,const int num)
54 {
55 int tmp = 0,n = 0,i = 0;
56 if(num < 0)
57 {
58 n = -num;
59 i = 1;
60 }
61 while(n != 0)
62 {
63 tmp = tmp * 10 + n%10;
64 n /= 10;
65 }
66 while(i<strLen && tmp != 0)
67 {
68 str[i++] = tmp % 10 + '0';
69 tmp /= 10;
70 }
71 }
