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  1.  
  2. void reverse()
  3. {
  4.     struct listNode *p, *q, *r;
  5.  
  6.     p = head;
  7.     q = NULL;
  8.  
  9.     while( p != NULL )
  10.     {
  11.         r = q;
  12.         q = p;
  13.         p = p->nextPtr;
  14.         q->nextPtr = r;
  15.     }
  16.  
  17.     head = q;
  18. }
  19.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.c: In function ‘reverse’:
prog.c:6:9: error: ‘head’ undeclared (first use in this function)
prog.c:6:9: note: each undeclared identifier is reported only once for each function it appears in
prog.c:7:9: error: ‘NULL’ undeclared (first use in this function)
prog.c:13:14: error: dereferencing pointer to incomplete type
prog.c:14:10: error: dereferencing pointer to incomplete type
stdout 
Standard output is empty
https://ideone.com/Z7qMOu
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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