编写函数实现：整型数转换成字符串

#include "stdio.h"
#include "stdlib.h"
#include "string.h"

void int_to_str(unsigned int src,unsigned char* dest);

void main(void)
{
unsigned int num = 0;
unsigned char str[11] = {0};
printf("scanf a number:\n");
scanf("%d",&num);
int_to_str(num,str);
printf("after convert: %s\n",str);
}

void int_to_str(unsigned int src,unsigned char* dest)
{
char pos = 0;
char len = 0;
if(NULL == dest)
return ;
do{
dest[pos++] = src % 10 + '0';
}while(src /= 10);
dest[pos] = '\0';
len = strlen((const char*)dest);
for(pos = 0;pos < len/2;pos++)
{
dest[pos] += dest[len-pos-1];
dest[len-pos-1] = dest[pos]-dest[len-pos-1];
dest[pos] -= dest[len-pos-1];
}
}