函数名: swab 
 功  能: 交换字节 
 用  法: #include <stdlib.h> 
         void swab (char *from, char *to, int nbytes); 
 程序例: 
#include <stdlib.h> 
 #include <stdio.h> 
 #include <string.h> 
char source[15] = "rFna koBlrna d"; 
 char target[15]; 
int main(void) 
 { 
    swab(source, target, strlen(source)); 
    printf("This is target: %s\n", target); 
    return 0; 
 }