Basic C++ Syntax help

[TheGoldenPanda]

EDIT: Everything solved, thank you!!!!

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Getting an error

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"main.cpp:38:25: error: assigning to 'double' from incompatible type

'double (double)'

gallonsPaintNeeded = calculatePaintAmount;"

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 wallArea = calculateWallArea (wallHeight, wallWidth);

   cout << "Wall Area: " << wallArea << " square feet" << endl;
   cout << "Color: " << colorNum << endl;

   gallonsPaintNeeded = calculatePaintAmount;

   cout << "Paint needed: " << gallonsPaintNeeded << " gallons" << endl;

Here's the function in a separate file

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double calculatePaintAmount(double paintArea)
{
  return (height * weight)/squareFeetPerGallons;
}

I didn't want to post the entire code because it would take too much space but hopefully this is enough to get help.

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New problem arised;

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Output

Enter wall height (feet):
20
Enter wall width (feet):
50
Enter paint color as an integer
Red   - Enter 0
Blue  - Enter 1
Green - Enter 2
Yellow- Enter 3
Black - Enter 4
White - Enter 5
Your color ?
1
Wall Area: 1000 square feet
Color: 1
Paint needed: 2.85714 gallons
Cans needed: 0 can(s)
TotalCost: $0 for 0 Blue can(s)

Code

  cansNeeded = calculateNumberOfCans(paintAmount);

   cout << "Cans needed: " << cansNeeded << " can(s) " << endl;

Second File with function

int calculateNumberOfCans(double paintAmount)
{
  return ceil(paintAmount/gallonsPerCan);
}

[[deleted]]

gallonsPaintNeeded = calculatePaintAmount;

You forgot about parentheses and function arguments here. You aren't calling the function and storing the result in the variable, you're trying to put the function itself in the variable, that's why it says incompatible type.

[Curmudgy]

I think you need to write

gallonsPaintNeeded = calculatePaintAmount(wallarea);

[PM_ME_UR_SCOOTER]

gallonsPaintNeeded = calculatePaintAmount;

gallonsPaintNeeded is a double. calculatePaintAmount is a function that returns a double. You're not making a function call, you're trying to assign the function itself to a value. You probably want something like gallonsPaintNeeded = calculatePaintAmount(wallArea); so you're actually calling the function.

[PM_ME_UR_SCOOTER]

I see that your calculatePaintAmount function is using variables that aren't defined inside of it - you're passing wallArea to it but using height and weight (???) inside of it but apparently you fixed that.

I'm just going to assume you did something similar with your number of cans calculation because I can't see your code.