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int total (tipo_arvore *raiz)
{
  int result = 0;
 
  if (raiz != NULL)
  {
    result += total(raiz->esq);
    result += total(raiz->dir);
    result += 1;
  }
 
  return result;
 
}
 
// Chamada:
int total_esquerda = total(raiz->esq);

prog.c:1:12: error: unknown type name ‘tipo_arvore’
 int total (tipo_arvore *raiz)
            ^~~~~~~~~~~
prog.c:17:22: warning: implicit declaration of function ‘total’ [-Wimplicit-function-declaration]
 int total_esquerda = total(raiz->esq);
                      ^~~~~
prog.c:17:28: error: ‘raiz’ undeclared here (not in a function)
 int total_esquerda = total(raiz->esq);
                            ^~~~

Standard output is empty