my_itoa

 1 #include <iostream>
 2 using namespace std;
 3 char *my_reverse(char* s)
 4 {
 5     char *p,*q;
 6     p=s;q=s;
 7     while(*q!=‘\0‘)
 8         q++;
 9     q--;
10     char temp;
11     while(q>=p)
12     {
13         temp=*q;
14         *q--=*p;
15         *p++=temp;
16     }
17     return s;
18 }
19 char* my_itoa(int num)
20 {
21     static char s[100];
22     int i=0;
23     int isNegative=num;
24     if(isNegative<0)
25         num*=-1;
26     while(num)
27     {
28         s[i]=num%10+‘0‘;
29         num/=10;
30         i++;
31     }
32     if(isNegative<0)
33         s[i++]=‘-‘;
34     s[i]=‘\0‘;
35     return my_reverse(s);
36 }
37 int main()
38 {
39     int num=123;
40     cout<<my_itoa(num)<<endl;
41     system("pause");
42     return 0;
43 }