18 the topic how to do ah

CodePudding user response:

Of not good, only supplies the reference

 

#include  
#include  

Typedef struct NUM 
{
Int num. 
Struct NUM * next; 
} Num. 

Void print (Num * p) 
{
If (p==NULL) return; 
While (p - & gt; Next!=NULL) 
{
Printf (" % d ", p - & gt; Num); 
P=p - & gt; Next; 
} 
printf("\n"); 
} 


Int main () 
{
The FILE * FILE; 
The file=fopen (" t.t xt ", "r +"); 
if (! The file) 
{
Printf (" file open error! \n"); 
return 1; 
} 
Num * p, * head=(Num *) malloc (sizeof (Num)); 
if (! The head) return 2; 
The head - & gt; Next=NULL; 
P=the head; 
while (! The feof (file)) 
{
The fscanf (the file "% d", & amp; (p - & gt; Num)); 
P - & gt; Next=(Num *) malloc (sizeof (Num)); 
if (! (p - & gt; Next)) return 2; 
P=p - & gt; Next; 
P - & gt; Next=NULL; 

} 
The fclose (file); 
Print (the head); 

Num * t=NULL, * q=(Num *) malloc (sizeof (Num)); 
if (! Q) the return 2; 
The scanf (" % d ", & amp; Q - & gt; Num); 
Q - & gt; Next=NULL; 

P=the head; 
While (1) 
{
If (p - & gt; Num & lt; Q - & gt; Num) 
{
T=p; 
P=p - & gt; Next; 
If (p - & gt; Next==NULL) 
{
T - & gt; Next=q; 
Q - & gt; Next=p; 
break; 
} 
continue; 
} 

If (p==head) 
{
T=head; 
The head=q; 
The head - & gt; Next=t; 
break; 
} 
The else {
T - & gt; Next=q; 
Q - & gt; Next=p; 
break; 
} 

} 
Print (the head); 

The file=fopen (" t.t xt ", "w +"); 
if (! The file) 
{
Printf (" file open error! \n"); 
return 1; 
} 
P=the head; 
While (p - & gt; Next) 
{
Fprintf (the file "% d", p - & gt; Num); 
P=p - & gt; Next; 
} 
The fclose (file); 
}