編寫壹個C++程序，輸入六個字母abcdef，然後倒順輸出？

#include <string.h>

using namespace std;

void swap(char *s)

{

int len, i;

char tmp;

len = strlen(s)-1;

for (i = 0; i <= len/2; ++i)

{

tmp = s[i];

s[i] = s[len-i];

s[len-i] = tmp;

}

}

int main(void)

{

char s[] = "abcdef";

swap(s);

cout<<s<<endl;

return 0;

}