For some reason, the variables I try to pass by value (errorFlag between Main() and ReadDials() and testDigit between ToDigit() and ReadDials()) don't get passed. The variables passed by reference get passed fine. As a work-around I passed a temp variable for each and copied the value from the temp reference variable to the value passed variable in each method, but I'm confused as to why I'm not getting the 'by value' value passed.
Sorry if this is a stupid question.
Thanks.
Jim
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Lab4x
{
class Program
{
// AcknowledgeCall Method - Write modified phone number to console
static void AcknowledgeCall(char digitOne, char digitTwo, char digitThree,
char digitFour, char digitFive, char digitSix, char digitSeven, char digitEight)
{
Console.WriteLine();
Console.WriteLine("{0}{1}{2}{3}{4}{5}{6}{7}", digitOne, digitTwo, digitThree, digitFour, digitFive, digitSix, digitSeven, digitEight);
Console.WriteLine();
return;
}
// ReadDials Method - Read phone number string and store in variables
static int ReadDials(int errorFlag, ref int errorHolder, ref string phoneNumber, ref char digit1, ref char digit2, ref char digit3, ref char digit4, ref char digit5,
ref char digit6, ref char digit7, ref char digit8)
{
errorHolder = 0; // Declare local variables
char holder = 'x';
errorFlag = 0;
if ((phoneNumber.Length != 1) & (phoneNumber.Length <= 7)) // Check for invalid phone number length
{ // and flag as invalid characters (null characters)
errorFlag = -1;
}
else
{
digit1 = phoneNumber[0]; // Assign first digit of number into 'digit1'
if (((digit1 == 'Q') | (digit1 == 'q')) & ((phoneNumber.Length == 1))) // Check for user quit code
{
errorFlag = -5;
}
else
{
ToDigit(digit1, ref errorFlag, ref holder); // Call ToDigit method
digit1 = holder;
}
if (errorFlag == 0) // If first character is not flagged for
{ // error, assign second phone number digit
digit2 = phoneNumber[1]; ToDigit(digit2, ref errorFlag, ref holder); // and call ToDigit method
digit2 = holder;
}
if (errorFlag == 0)
{ // Check for error, assign third digit,
digit3 = phoneNumber[2]; ToDigit(digit3, ref errorFlag, ref holder); // and call ToDigit method
digit3 = holder;
}
if (errorFlag == 0)
{ // Check for error, assign fourth digit,
digit4 = phoneNumber[3]; // should be a hyphen so do not call
} // ToDigit method
if (errorFlag == 0)
{
digit5 = phoneNumber[4]; ToDigit(digit5, ref errorFlag, ref holder); // Check for error, assign fifth digit,
digit5 = holder; // and call ToDidgit method
}
if (errorFlag == 0)
{
digit6 = phoneNumber[5]; ToDigit(digit6, ref errorFlag, ref holder); // Check for error, assign sixth digit,
digit6 = holder; // and call ToDigit method
}
if (errorFlag == 0)
{
digit7 = phoneNumber[6]; ToDigit(digit7, ref errorFlag, ref holder); // Check for error, assign seventh digit,
digit7 = holder; // and call ToDigit method
}
if (errorFlag == 0)
{
digit8 = phoneNumber[7]; ToDigit(digit8, ref errorFlag, ref holder); // Check for error, assign eighth digit,
digit8 = holder; // and call ToDigit method
}
}
if (digit4 != '-') // If fourth digit is not a hyphen
{ // return an error code
errorFlag = -4;
}
if (digit1 == '0') // If first digit is a zero
{ // return an error code
errorFlag = -2;
}
if ((digit1 == '5') & (digit2 == '5') & (digit3 == '5')) // If prefix is '555'
{ // return an error code
errorFlag = -3;
}
errorHolder = errorFlag;
return errorFlag;
}
// Method ToDigit
static char ToDigit(char testDigit, ref int errorTest, ref char tempHolder)
{
testDigit = Char.ToUpper(testDigit); // Convert Character to UpperCase
char result; // Declare char variable to hold result
switch (testDigit)
{
case '0': result = '0'; break; // Match each digit with corresponding
case '1': result = '1'; break; // numerical value using switch command
case '2':
case 'A':
case 'B':
case 'C': result = '2'; break;
case '3':
case 'D':
case 'E':
case 'F': result = '3'; break;
case '4':
case 'G':
case 'H':
case 'I': result = '4'; break;
case '5':
case 'J':
case 'K':
case 'L': result = '5'; break;
case '6':
case 'M':
case 'N':
case 'O': result = '6'; break;
case '7':
case 'P':
case 'Q':
case 'R':
case 'S': result = '7'; break;
case '8':
case 'T':
case 'U':
case 'V': result = '8'; break;
case '9':
case 'W':
case 'X':
case 'Y':
case 'Z': result = '9'; break;
default: result = 'e'; break;
}
if (result == 'e')
{
errorTest = -1; // Return error if non-alphanumeric character is present
}
else
{
errorTest = 0; // else return 0
}
tempHolder = result;
return testDigit;
}
// Main Method
static void Main(string[] args)
{
char digit1 = 'o', // Declare and initialize eight variables to
digit2 = 'o', // hold individual phone number digits
digit3 = 'o',
digit4 = 'o',
digit5 = 'o',
digit6 = 'o',
digit7 = 'o',
digit8 = 'o';
string phoneNo; // Declare variables
int errorFlag = 0,
tempErrorCode = 0;
while (errorFlag != -5) // Begin loop
{
Console.WriteLine("Enter a phone number. (Q to quit)"); // Get phone number input from user
phoneNo = Console.ReadLine();
Console.WriteLine();
ReadDials(errorFlag, ref tempErrorCode, ref phoneNo, ref digit1, ref digit2, ref digit3, // pass variables by reference
ref digit4, ref digit5, ref digit6, ref digit7, ref digit8); // to ReadDials Method
errorFlag = tempErrorCode;
switch (errorFlag)
{
case 0:
AcknowledgeCall(digit1, digit2, digit3, digit4, digit5, digit6, digit7, digit8);
break;
case -1:
Console.WriteLine("ERROR - An invalid character was entered."); // Determine output based on
break; // returned error codes
case -2: // using switch command
Console.WriteLine("ERROR - Phone number cannot begin with 0.");
break;
case -3:
Console.WriteLine("ERROR - Phone number cannot begin with 555.");
break;
case -4:
Console.WriteLine("ERROR - Hyphen is not in the correct position.");
break;
case -5:
Console.WriteLine("Exiting program. ");
break;
}
}
}
}
}
