Cell Phone Bill

Ralphus629 (14)
Hey guys this is my first time posting so please bear with me.

So I have this assignment for my C++ class to write a program that calculates and prints my cell phone bill.

I have most of the code done but my issue is the input of the account number. My code is:


        cout << "Please enter your 6-digit account number: ";  
	cin >> accountNum;
	cout << endl;

	 if (accountNum > 100000)
		{
		  cin >> accountNum; 
		  cout << endl;
		}
	 else 
	    {
		  cout << "Invalid entry, please re-enter a 6-digit account number: "; 
		  cin >> accountNum;
		  cout << endl; 
	    }


How can I restrict the user input to only 6 digits without any accounts starting with leading 0's such as "000265", rejecting such entries prompting the user to re enter a valid account number?

p.s: how do I get the program to print output to a file? Thanks
prophetjohn (70)
Use a do-while loop that checks if the number the user entered is greater than 999999. Keep asking until they give you a number that is not
Last edited on
TheMeerkat (145)
to add to prophets comment, or less than 100000. It'll be something along the lines of this:

do{

//code goes here

}while(accountNum >999999 || accountNum < 100000);
Ralphus629 (14)
So now I have this as my whole code but now cout is ambiuous, how cant I resolve this?



#include <iostream> 
#include <iomanip>
#include <string>

using namespace std; 

const double rService = 10.00; 
const double rPerMinute = 0.20;
const double pService = 25.00;
const double pPerMinuteDay = 0.10;
const double pPerMinuteNight = 0.05;


int main()

{
	
	int regMinutes;
	int dayMinutes;
	int nightMinutes; 
	int accountNum;
	char serviceType;
	double amountDue; 
	

/*	cout << "Please enter your 6-digit account number: ";  
	cin >> accountNum;
	cout << endl;
*/
    do{
		cout << "Please enter your 6-digit account number: "; 
		cin >> accountNum;
	  }while (accountNum >999999 || accountNum < 100000);
/*	 if (accountNum > 99999 && accountNum < 999999)
		{
		  cin >> accountNum; 
		  cout << endl;
		}
	 else 
	    {
		  cout << "Invalid entry, please re-enter a 6-digit account number: "; 
		  cin >> accountNum;
		  cout << endl; 
	    }
*/
	cout << "Enter a service code: R or r (Regular), P or p (Premium): ";
    cin >> serviceType;
	cout << endl; 
		
	switch (serviceType)
	 {
	 case 'r':
	 case 'R':
		 cout << "Enter the number of minutes used: ";
		 cin >> regMinutes; 
		 cout << endl; 

	  if (regMinutes > 50)
	     {
		   amountDue = rService + ((regMinutes - 50) * rPerMinute);
	     }
      else
        amountDue = rService;

     break;
	 
	 case 'p':
	 case 'P': 
		 cout << "Enter the minutes used for the day: ";
		 cin >> dayMinutes; 
		 cout << endl;     

      if (dayMinutes > 75) 
		  amountDue = pService + ((dayMinutes - 75) * pPerMinuteDay);
	  else
          amountDue = pService;

	     cout << "Enter the minutes used for the night: ";
     	 cin >> nightMinutes; 
		 cout << endl;
      
      if (nightMinutes > 100)
		  amountDue = pService + ((nightMinutes - 100) * pPerMinuteNight);
	  else 
		  amountDue = pService; 

	  break;

	 }

	 cout << "Account Number: " << accountNum << endl; 
	 cout << "Type of Service: " << serviceType << endl; 

	 switch (serviceType)
	     {
		 case 'R':
		 case 'r':
		 cout << "Number of minutes used (if regular): " << regMinutes << endl; 
		 break;
	 
		 case 'P':
		 case 'p':
	     cout << "Number of minutes used during the day (if premium): " << dayMinutes << endl; 
 	     cout << "Number of minutes used during the night (if premium): " << nightMinutes << endl; 
 
		 break;

	     }

	 cout << fixed << showpoint; 
	 cout << setprecision(2);
	 cout << "Amount Due = $ " << amountDue << endl;

	return 0;
	
}


Also, how would I get this to print the output in a file?
wolfgang (381)
I don't see why cout is giving you an undefined reference. It works fine when I compiled. Check your compiler.
For your print to file question use fstream.

#include <fstream> // Required header
//Then in your code define the output file to use.
std::ofstream fout("bill.txt");
// Then use it just as you would with cout. Same operators and stream manipulators will work. Including endl.

fout << "This will write to \"bill.txt.\"\n";
Ralphus629 (14)
It worked now, thanks so much. After I went with the do-while loop the cout became ambiguous on visual studio, but after I restarted it, the program build and it ran flawlessly. Thanks again all!
mike3334 (1)
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void GetData(int ages[], int capacity, int& n)

// Given: access to an array and its capacity
// Action: get input from keyaboard for each cell and put the final number of cells in n
{
	//	cout << "@" << __FUNCTION__ << "@" << endl;
	int i;
	for(i=0; cin && i<capacity; i++) {
		cout << "Enter an age or CTRL-Z when done: ";
		cin >> ages[i];
	} // for
	cin.clear();
	n=i-1;	
	cout << n << " records were read. " << endl;
	return;
} // GetData

void Initialize(int x[],int n,int initValue)

// Given: access to an array of n values
// Action: initialize each of the n cells in the array to 0
{
	//	cout << "@" << __FUNCTION__ << "@" << endl;
	int i;
	for(i=0; i<n; i++) {
		x[i]=initValue;
	} // for
	return;
} // Initialize

void Random(int x[], int low, int high, int n)

// Given: access to an array of n values
// Action: initialize each of the n cells in the array to a random value between low and high
{
	//	cout << "@" << __FUNCTION__ << "@" << endl;
	int i;
	for(i=0; i<n; i++) {
		x[i]=rand(low,high);
	} // for

	return;
} // Random

void Display(const int x[], int n)

// Given: access to an array of n values
// Action: display each cell with its index
{
	//	cout << "@" << __FUNCTION__ << "@" << endl;
	int i;
	for(i=0; i<n; i++) {
		cout << "Cell " << setw(3) << i << ":";
		cout << setw(5) << x[i] << endl;
	} // for

	return;
} // Display

int Sum(const int x[], int n)

// Given: access to an array of n values
// Return: the sum of the first n values of x
{
	cout << "@" << __FUNCTION__ << "@" << endl;
	int result=0;

	return result;
} // Sum

double Average(const int x[], int n)

// Given: access to an array of n values
// Return: the average of the first n values of x or 0.0 if n is 0
{
	cout << "@" << __FUNCTION__ << "@" << endl;
	double result=0.0;

	return result;
} // Average


int Min(const int x[], int n)

// Given: access to an array of n values
// Return: the smallest value of x
{
	cout << "@" << __FUNCTION__ << "@" << endl;
	int result=0;

	return result;
} // Min


int Max(const int x[], int n)

// Given: access to an array of n values
// Return: the largest value of x
{
	cout << "@" << __FUNCTION__ << "@" << endl;
	int result=0;

	return result;
} // Max


int IndexOfMin(const int x[], int n)

// Given: access to an array of n values
// Return: the index of the smallest value of x
{
	cout << "@" << __FUNCTION__ << "@" << endl;
	int result=0;

	return result;
} // IndexOfMin

int IndexOfMax(const int x[], int n)
// Written by: <your name>
// Given: access to an array of n values
// Return: the index of the largest value of x
{
	cout << "@" << __FUNCTION__ << "@" << endl;
	int result=0;

	return result;
} // IndexOfMax

int LinearSearch(int key, const int x[], int n)

// Given: access to an array of n values
// Return: the index of the cell that matches key
{
	cout << "@" << __FUNCTION__ << "@" << endl;
	int result=-1;

	return result;
} // LinearSearch

int BinarySearch(int key, const int x[], int first, int last)

// Given: 	a value to search for (the key)
//		the array to search (x)
//		the index of the first cell to consider
//		the index of the last cell to consider
// Returns:	the index of the cell whose value matches key
//		or -1 if there is no match 
{
	//	cout << “@” << __FUNCTION__ << “@” << endl;
	int result=-1;
	int middle=(first+last)/2;

	if(first>last) {
		result=-1;
	} else if(key<x[middle]) { // if key is in x it must be in first part
		result=BinarySearch(key,x,first,middle-1);
	} else if(key==x[middle]) { // found it! return its index!
		result=middle;
	} else { // key must be > x[middle] so it must be in the last part
		result=BinarySearch(key,x,middle+1,last);
	} // if
	return result;
} // BinarySearch

void Exchange(int& x, int& y)

// Given: access to two arguments, x and y
// Action: exchanges the contents of x and y 
// Example: if x is 5 and y is 3, Exchange(x,y) will make x 3 and y 5
{
	//	cout << “@” << __FUNCTION__ << “@” << endl;
	int temp=x;
	x=y;
	y=temp;
	return;
} // Exchange 

void BubbleSort(int key[], int n)

// Given access to the array and the number of values to sort
// Action: the values in the array are arranged in ascending order
{
	//	cout << “@” << __FUNCTION__ << “@” << endl;
	int i, pass;
	bool needsSorting=true;
	for(pass=1; pass<n; pass++) {
		for(i=0; i<n-1; i++) {
			if(key[i]>key[i+1]) {
				Exchange(key[i],key[i+1]);				
			} // if
		} // for
	} // for
	return;
} // BubbleSort

#endif  // last line

Last edited on
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