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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. #include <string.h>
  5.  
  6. class String; //We need to know there will be a class String for Boolean declaration
  7.  
  8. class Boolean {
  9.     bool value = false;
  10.     public:
  11.         Boolean(bool value) { this -> value = value; }
  12.         //We can't implement this yet since it requires 
  13.         // calling String functions which haven't been declared yet
  14.         String toString(); 
  15. };
  16.  
  17. class String {
  18.     char* value;
  19.     public:
  20.         String(const char* value) { this -> value = strdup(value); }
  21.         //This is fine to implement since Boolean is already fully declared
  22.         Boolean isEmpty() { return Boolean(!strcmp(value, "")); }
  23. };
  24.  
  25. //String has been declared, now we can implement this function
  26. String Boolean::toString() { return String(value ? "true" : "false"); }
  27.  
  28. int main() {
  29. 	// your code goes here
  30. 	return 0;
  31. }
Success #stdin #stdout 0s 15232KB
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https://ideone.com/xL5cao
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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