cannot convert double

[sea711]

Beginner here, how do i get this double to work?

error:cpp:12: error: cannot convert ‘double’ to ‘double*’ for argument ‘1’ to ‘void thai(double*)

  #include <iostream>
  
  using namespace std;
  
  void thai(double *t);
  void dub(int *n);
  
  int main()
  {
     double input = 7.8;
  
     thai(input);
  
     return 0;
  }
  
  void thai(double *t)
  {
     *t *= 2;
  
  }
  void dub(int *n)
  {
     *n *= 2;
  }

[Disch]

'input' is a double

thai takes a double* as a parameter. Note the * there... that indicates the type is not a double... but rather is a pointer to a double.

So you need to give thai the address of a double. You can do this with the address-of operator:

thai( &input ); // <- note:  '&input' instead of just 'input'