怎样将一个整数转化成字符串数，并且不用函数itoa

1 #include<iostream>
2 using namespace std;
3 int main()
4 {
5     int num = 12345, j = 0, i = 0;
6     char temp[7], str[7];
7
8     while (num)
9     {
10         temp[i] = num % 10 + '0';
11         i++;
12         num = num / 10;
13     }
14     temp[i] = 0;
15     printf("temp=%s\n", temp);
16     i = i - 1;
17     printf("temp=%d\n", i);
18     while (i >= 0)
19     {
20         str[j] = temp[i];
21         j++;
22         i--;
23     }
24     str[j] = 0;
25     printf("string=%s\n", str);
26     system("PAUSE");
27     return 0;
28 }

#include<iostream>
using namespace std;
int main (void)
{
int num = 100;
char str[25];
itoa(num, str, 10);
cout<<num<<" "<<str;
return 0;
}