怎么把一个int数组转化为char型数组？？

/*
234
Press any key to continue
*/
#include <stdio.h>

int main() {
int i,num = ,n;
char ch,s[];
for(n = ; num; ++n) {
s[n] = num %  + '';
num /= ;
}
s[n] = '\0';
for(i = ; i < n / ; ++i) {
ch = s[i];
s[i] = s[n -  - i];
s[n -  - i] = ch;
}
puts(s);
return ;
}