解答C语言问题。检测自己的水平，也方便萌新学习

指针数组字符串怎么区分清楚直白运用

#include <stdio.h>
#include <stdlib.h>
int main(void)
{
test();
system("PAUSE");
return 0;
}
int test(void)
{
int i;
char fileString[15];
FILE *file = fopen("D:\\test.txt", "a+");
fprintf(file, "%s", "Hello");
fclose(file);
FILE *file_1 = fopen("D:\\test.txt", "r");
for (i = 0; !feof(file_1); i++)
{
fileString[i] = fgetc(file_1);
}
fclose(file_1);
printf("%s", fileString);
return 0;
}
运行结果输出的除了Hello以外还有一个空格和很多的‘烫’怎么解决

俺想问下avl树删除的思路是啥 CSDN上虽然有代码但是看不懂

大佬救我qwq萌新哭了

#include<stdio.h>
#include<math.h>
char max(char a, char b, char c)
char min(char a, char b, char c);
void main()
{char a,b,c,d,e,f;
scanf("%c%c%c",&a,&b,&c);
d=max(a,b,c);
e=min(a,b,c);
(f=a||f=b||f=c)&&f!=d&&f!=e;
printf("%c%c%c",e,f,d);
}
char max(char a,b,c)
{ char d;char e;
if ( a>b )
d = a;
else
d = b;
if ( d>c )
e = d;
else
e = c;
return (e);
}
char min(char a,b,c)
( char d,e;
if ( a<b )
d = a;
else
d = b;
if ( d<c )
e = d;
else
e = c;
return (e);
}