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#include <stdio.h>
 
void que(StackType *s1, StackType *s2)
{
	int i,n;
	n = s1->top;
	for (i = n; i > -1; i--)
	{
		push(s2, pop(s1));
	}
}
 
int Out(StackType *s1,StackType *s2)
{
	int num;
	if (is_empty(s2))
	{
		que(s1, s2);
		num = pop(s2);
		return num;
	}
	else
	{
		num = pop(s2);
		return num;
	}
}
 
int main(void)
{
	StackType s1, s2;
 
	init_stack(&s1);
	init_stack(&s2);
 
 
	push(&s1, 10);
	push(&s1, 20);
 
	Out(&s1, &s2);
	printf("%d", Out(&s1,&s2));
 
	getchar();
 

prog.c:3:10: error: unknown type name ‘StackType’
 void que(StackType *s1, StackType *s2)
          ^~~~~~~~~
prog.c:3:25: error: unknown type name ‘StackType’
 void que(StackType *s1, StackType *s2)
                         ^~~~~~~~~
prog.c:13:9: error: unknown type name ‘StackType’
 int Out(StackType *s1,StackType *s2)
         ^~~~~~~~~
prog.c:13:23: error: unknown type name ‘StackType’
 int Out(StackType *s1,StackType *s2)
                       ^~~~~~~~~
prog.c: In function ‘main’:
prog.c:31:2: error: unknown type name ‘StackType’
  StackType s1, s2;
  ^~~~~~~~~
prog.c:33:2: warning: implicit declaration of function ‘init_stack’ [-Wimplicit-function-declaration]
  init_stack(&s1);
  ^~~~~~~~~~
prog.c:37:2: warning: implicit declaration of function ‘push’ [-Wimplicit-function-declaration]
  push(&s1, 10);
  ^~~~
prog.c:40:2: warning: implicit declaration of function ‘Out’ [-Wimplicit-function-declaration]
  Out(&s1, &s2);
  ^~~
prog.c:43:2: error: expected declaration or statement at end of input
  getchar();
  ^~~~~~~

Standard output is empty