Originally Posted by VernonDozier

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#include <iostream>
#include <cmath>


using namespace std;



int GetNonNegativeInteger ()
{
     int input;
     cin >> input;
     while (input < 0)
     {
          // display error message.
          // ask for input again
     }

     return input;
}



int main ()

{
		double const pi=3.14159;
		int radius,
			length,
			width,
			base,
			height,
			choice;
		double	area;
		
		

	//Display the menu and get the user's choice
		cout << "         Geometry Calculator \n\n";
		cout << "1. Calculate the Area of a Circle\n";
		cout << "2. Calculate the Area of a Rectangle\n";
		cout << "3. Calculate the Area of a Trainge\n";
		cout << "4. Quit\n";
		cout << "\n";

		cout <<"Enter your choice (1-4): ";
		cin >> choice;
		cout << "\n";

		if (choice==1)
		   {cout << "Please enter the radius of the circle: ";
			radius = GetNonNegativeInteger ();
			area = radius * pi;
			cout << "The area of the circle is: " << area << endl;}

		   else if (choice==2)
		   {cout << "Please enter the length of the rectangle: ";
			length = GetNonNegativeInteger ();
			cout << "Please enter the width of the rectangle: ";
			width = GetNonNegativeInteger ();
			area = length * width;
			cout << "The area of the rectangle is: " << area << endl;}
     
			else if (choice==3)
			{cout << "Please enter the base length of the triangle: ";
			cin >> base;
			cout << "Please enter the height of the triangle: ";
			cin >> height;
			area = (base * height)/2;
			cout << "The area of the triangle is: " << area << endl;}
     
			else if (choice==4)
			{cout << "Thanks for trying the Geometry Calculator\n";}

			else
			{cout << "You can only select options 1-4, run the program again and select a option 1-4\n"; }
     
     
		return 0;

}

#include <iostream> #include <cmath> using namespace std; int GetNonNegativeInteger () { int input; cin >> input; while (input < 0) { // display error message. // ask for input again } return input; } int main () { double const pi=3.14159; int radius, length, width, base, height, choice; double area; //Display the menu and get the user's choice cout << " Geometry Calculator \n\n"; cout << "1. Calculate the Area of a Circle\n"; cout << "2. Calculate the Area of a Rectangle\n"; cout << "3. Calculate the Area of a Trainge\n"; cout << "4. Quit\n"; cout << "\n"; cout <<"Enter your choice (1-4): "; cin >> choice; cout << "\n"; if (choice==1) {cout << "Please enter the radius of the circle: "; radius = GetNonNegativeInteger (); area = radius * pi; cout << "The area of the circle is: " << area << endl;} else if (choice==2) {cout << "Please enter the length of the rectangle: "; length = GetNonNegativeInteger (); cout << "Please enter the width of the rectangle: "; width = GetNonNegativeInteger (); area = length * width; cout << "The area of the rectangle is: " << area << endl;} else if (choice==3) {cout << "Please enter the base length of the triangle: "; cin >> base; cout << "Please enter the height of the triangle: "; cin >> height; area = (base * height)/2; cout << "The area of the triangle is: " << area << endl;} else if (choice==4) {cout << "Thanks for trying the Geometry Calculator\n";} else {cout << "You can only select options 1-4, run the program again and select a option 1-4\n"; } return 0; }

See red. You would do the same for base and height in option number 3. Have you used functions before? You need to change the commented parts of the function.