错误：冲突的类型 [英] Error: conflicting types

问题描述

我写code C语言为一项任务。

I am writing code in C for an assignment.

这是有关code：

 //operation: text(elem)
xml_list *text(xml_list *elem){
  if(isEmpty(elem)){
    return Nil();
  }
  return append(text1(head(elem)),text(tail(elem)));
}

//operation: text1(elem)
xml_list *text1(xml_list *elem){
  if(isText(elem)){
    return Cons(elem,Nil());
  }
  else{
    return text(childeren(elem));
  }
}

这给我的错误：错误：冲突的类型'文本1'
xml_list *文本1（xml_list * ELEM）{

我无法找出问题的根源。我一直在这8小时直，现在，我有点失去理智了这一点。请有人帮助我

I can't figure out the source of the problem. I have been working on this for 8 hours straight now, and I am kind of losing my mind over this. Please some one help me

推荐答案

按到达时间

return append(text1(head(elem)),text(tail(elem)));

编译器不知道文本1 的返回类型。因此，它假定 INT 并记住它。后来当它到达文本1的定义，这将是相互矛盾的。

The compiler doesn't know the return type of text1. So it assumes int and remembers it. And later when it reaches the definition of text1 it will be conflicting.

要解决这个前锋text1的声明像

To solve this forward declare text1 like

xml_list *text1(xml_list *); // <---- Here

xml_list *text(xml_list *elem){
  if(isEmpty(elem)){
    return Nil();
  }
  return append(text1(head(elem)),text(tail(elem)));
}

//operation: text1(elem)
xml_list *text1(xml_list *elem){
  if(isText(elem)){
    return Cons(elem,Nil());
  }
  else{
    return text(childeren(elem));
  }
}

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