我有一个歌曲库,用户将在其中输入歌曲并将成为链接列表,但是我在有序列表中的插入不起作用。
Node *insertIntoOrderedList(Node *head, char *songName, char *artist, char *genre) {
if (head == NULL || songName < head -> songName) {
return newNode(songName, artist, genre, head); // a new head of the list
}
Node *current = head;
while (current -> link != NULL && songName <= current -> link -> songName)
current = current -> link;
current -> link = newNode(songName, artist, genre, current -> link);
return head;
}
现在当我打印链表时,它将按我输入的顺序排列,所以如果我输入B,A,C。当我打印列表时,它将是BAC而不是ABC。
答案 0 :(得分:2)
问题是你在比较指针而不是比较指针指向的字符串。
例如,在本声明中,我认为应该有
if (head == NULL || songName < head -> songName) {
而不是
strcmp
同样适用于比较指针而不是字符串本身的其他语句。
那就是你应该使用标题<string.h>
中声明的标准C函数while (current -> link != NULL && songName <= current -> link -> songName)
current = current -> link;
来比较字符串而不是指针。
也在这个循环中
songName <= current -> link -> songName
条件current -> link -> songName
是错误的。当songName
小于或等于while (current -> link != NULL && strcmp( songName, current -> link -> songName ) >= 0 )
current = current -> link;
时,循环必须迭代。
因此它应该看起来像
import os
#Lists files in the Import folder
for file in os.listdir("Imports"):
if file.endswith(".wav" or ".mp3"or ".txt"):
print file
#imports file into the editor
selected_file = raw_input("Which do you wish to modify?")
if selected_file in ("Imports"):
new_file = selected_file
print new_file
else:
print("File does not exist or not available. please select another.")
It outputs:
boom.wav
Which do you wish to modify?