Thread: Uninitialized local variable

I am having trouble figuring out why I am getting an Unitialized Local Variable error in my code. The program calculates the charge associated with water depending on usage.
Here is the code:

Code:

// Description: Calculate the water bill given the cubic feet of water used for Eureka Water Company, which charges the homeowner based on the following rules.
/*
a. A flat rate of $15.00 for usage up to and including 1000 cubic feet.
b. $0.0175 per cubic foot for usage over 1000 cubic feet and up to and including 2000 cubic feet.
c. $0.02 per cubic foot for usage over 2000 cubic feet and up to and including 3000 cubic feet. 
d. A flat rate of $70.00 for usage over 3000 cubic feet.
*/

#include <iostream>
using namespace std;


void Read(int usage, double Charge);
void Print(double Charge);

void main ()
{
	int usage;
	double Charge;
	int x = 0;
	x = (x + 1);

Read(usage);

if(usage <= 1000)
	Charge = 15.00;
else if (usage > 1000 && usage <= 2000)
	Charge = 15.00 + (0.0175 * x);
else if (usage > 2000 && usage <=3000)
	Charge = 15.00 + 17.50 + ( 0.02 * x);
else 
	Charge = 70.00;

Print(Charge);
}

void Read(int usage, double Charge)
{
	// 1. Start
	int usage = 0;
	// 2. Prompt for Input
	cout << "Enter Water Usage: ";
	// 3. Read Input
	cin >> usage;
	// 4. Exit (Input returns via ref-param)
}

void Print(double Charge)
{
	// 1. Start
	// 2. Print Output
	cout << "The charge is :" << Charge << endl;
	// 3. Exit
}

The error shows

Code:

2>c:\users\tyler\documents\cs104labtemplate.cpp(31): warning C4700: uninitialized local variable 'usage' used
2>  lab6.vcxproj -> C:\Users\Tyler\Documents\Visual Studio 2010\Projects\lab6\Debug\lab6.exe
1>  lab5.2.vcxproj -> C:\Users\Tyler\Documents\Visual Studio 2010\Projects\lab6\Debug\lab5.2.exe
========== Rebuild All: 2 succeeded, 0 failed, 0 skipped ==========

I dug around on the forums and other C++ related sites and didn't find anything that would help fix the problem. Any help would be appreciated. Thanks.

Sorry I am just beginning to learn and use C++. I was under the assumption the 'Read' function assigned the usage value into the 'Main'? Do I need to reference the usage from 'Read' and then implement it into the 'Main' function? Or should I rename the usage in 'Read' to something else and assign a value to the usage in 'Main'?

I tried adding a reference to the usage and removing int from 'Read'. I still am getting the same error. The changes are:

Code:

// Description: Calculate the water bill given the cubic feet of water used for Eureka Water Company, which charges the homeowner based on the following rules.
/*
a. A flat rate of $15.00 for usage up to and including 1000 cubic feet.
b. $0.0175 per cubic foot for usage over 1000 cubic feet and up to and including 2000 cubic feet.
c. $0.02 per cubic foot for usage over 2000 cubic feet and up to and including 3000 cubic feet. 
d. A flat rate of $70.00 for usage over 3000 cubic feet.
*/

#include <iostream>
using namespace std;


void Read(int &usage, double Charge);
void Print(double Charge);

void main ()
{
	int usage;
	double Charge;
	int x = 0;
	x = (x + 1);

Read(usage);

if(usage <= 1000)
	Charge = 15.00;
else if (usage > 1000 && usage <= 2000)
	Charge = 15.00 + (0.0175 * x);
else if (usage > 2000 && usage <=3000)
	Charge = 15.00 + 17.50 + ( 0.02 * x);
else 
	Charge = 70.00;

Print(Charge);
}
void Read(int &usage, double Charge)
{
	usage = 0;
	cout << "Enter Water Usage: ";
	cin >> usage;	
}
void Print(double Charge)
{
	// 1. Start
	// 2. Print Output
	cout << "The charge is :" << Charge << endl;
	// 3. Exit
}

What am I missing?

Okay thanks I got it working right just had to open this project in a new file and it is compiling right. Thanks again!