int main(int argc, char *argv[]) {
if(argc != 5){
printf(" usage: P264 串1 串2 串3 串4\n");
return 29;
}
else{
printf(" 串4=%s 串3=%s 串2=%s 串1=%s\n", argv[4], argv[3], argv[2], argv[1]);
return 0;