反转字符串的程序,比如”abcdefghi” -> “ihgfedcba”
#include <stdio.h>
#include <string.h>
char *reverse(char *set)
{
int i,j;
char temp;
if(set == NULL)
return NULL;
for(i = 0,j = strlen(set) - 1; i < j; i++,j--)
{
temp = set[i];
set[i] = set[j];
set[j] = temp;
}
return set;
}
int main(void)
{
char set[] = "hello world";
reverse(set);
puts(set);
return 0;
}