Need help with this C++ program. Write a program that will input miles traveled

Question

Need help with this C++ program.

Write a program that will input miles traveled and hours spent in
travel. The program will determine miles per hour. This calculation must
be done in a function other than main; however, main will print the
calculation. The function will thus have 3 parameters: miles, hours, and
milesPerHour. Which parameter(s) are pass by value and which are
passed by reference? Output is fixed with 2 decimal point precision.

Sample Run:
Please input the miles traveled
475
Please input the hours traveled
8
Your speed is 59.38 miles per hour

Here is what I have so far:

//CPP program for calculate miles per hour
//Autumn Montgomery

#include<iostream>
using namespace std;

void calculation(double, double, double);

int main()
{
double miles;
double hours;
double mph;

cout << "Please input the miles traveled";
cin >> miles;
cout << "Please input the hours traveled";
cin >> hours;
calculation (miles, hours, mph);
system("pause");
}
void calculation(double m, double h, double mh)
{
double mph = (m / h);
cout << "You speed is " << mph << "miles per hour";
}

I keep getting an error that the uninitialized local variable 'mph' is being used.

What am I doing wrong?

Explanation / Answer

Hi.. I have written cpp for the above.

Main.cpp

#include<iostream>
#include <iomanip>
using namespace std;

void calculation(double, double, double*);

int main()
{
double miles;
double hours;
double mph=0;

cout << "Please input the miles traveled:";
cin >> miles;
cout << "Please input the hours traveled:";
cin >> hours;
calculation (miles, hours, &mph);
cout << "You speed is " << setprecision(4) << mph << " miles per hour";
//system("pause");
return 0;
}
void calculation(double m, double h, double* mh)
{
*mh = (m / h);

}

Output:

Please input the miles traveled:475                                                                                   

Please input the hours traveled:8                                                                                     

You speed is 59.38 miles per hour

Please test the code and let me know any issues. Thank you. All the best.

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