Not sure what is wrong with this thing.

[kmartar]

I am getting an error on line 31 and I cannot figure out what is wrong. Also when I need to go in a retype something or add something in the middle of a statement it erases what was already there instead of adding the typed letters to it. Please help.

 This program will use the equation d=1/2gt^2 to calculate 
the falling distance of an object. The function is called 
fallingDistance and accept an objects falling time as an 
argument.*/

#include <iostream>
#include <iomanip>  //Needed for set precision and setw functions.
#include <cmath>    // Needed for the pow function

using namespace std;

//Function Prototype.
double fallingDistance(double time);

int main()         // Main function. The main body of the program.
{
	//Variables.
	double g = 9.8, t = 1, d;
	char again;

	do
	{
		//Cout statements.
		cout << "Falling Distance" << endl;
		cout << "Time      Distance" << endl;
		cout << "-------------------" << endl;

		//For loop to iterate each time to calculate the distance
		for (t = 1; t < 10; t++)
		{
			cout << setw(3) << t << setw(10) << fallingDistance(time) << endl;
		}

		//Asks the user if they want to try again.
		cout << "Would you like to try agian? (y or n)";
		cin >> again;
	} while (again == 'Y' || again == 'y');

	system("pause");
	return 0;
}

/**********************************************************************
*                   fallingDistance Function                          *
* This function will calculate the distance an object has fallen in a *
* a given time. It uses the equation d=(1/2)gt(^2). Where d=distance, *
* g=9.8, and t=time. And returns the distance = d.                    *
**********************************************************************/
double fallingDistance(double time)
{
	double  d, t = 1;
	d = 1 / 2 * 9.8 * pow(t, 2);
		return d;
}

[Peter87]

I am getting an error on line 31 and I cannot figure out what is wrong.

What is time? You have not declared any variable in main() with such a name.

Also when I need to go in a retype something or add something in the middle of a statement it erases what was already there instead of adding the typed letters to it.

Look for a key on the keyboard that says "Insert". Press it (You might have to turn off Num Lock first).

[Codermik]

I think he is using time in the same context as you would srand, which in that case if you were using that then it expects a function parameter.

http://www.cplusplus.com/reference/ctime/time/

Normally passing a null value like time(0)

[cire]

I think he is using time in the same context as you would srand, which in that case if you were using that then it expects a function parameter.

Since the function in question takes a double, that doesn't seem likely.
double fallingDistance(double time)

OP should realize that 1/2 in the fallingDistance function is integer math, so d will always be 0. Make it 1.0 / 2.0 * 9.8 .... You may also want to actually use the parameter you pass in.

[kmartar]

Peter87 thank you so much!

cire you are awesome thank you for the final fix. Progam does the math correctly. I knew the equation didn't look right...lol