help with basic c++ function homework problem

EDN Admin · Jul 31, 2011

Please whoever answers this try to make it sim[le and easy I am very new at this.
this is the question:
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The program will input a phone number and the program will acknowledge the call by either writing an error message or the 8 digit phone number to the console window.
The phone number may have either digits, letters, or both.

<span style="font-size:11pt; font-family:"Arial","sans-serif"

All digits are sent back through parameters by reference.
Then, for each digit, the program will use a function named ToDigit(), which receives a single char argument (pass by reference) that may be a number or a letter of one of the digits dialed.
If it is a number, return 0 by value indicating it is a valid digit.
If the digit is a letter, the number corresponding to the letter is returned by reference and return 0 by value indicating it is a valid digit.
Here are the letters associated with each digit.

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K L
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N O
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B C
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Q R S
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E F
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U V
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H I
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X Y Z
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<span style="font-family:"Arial","sans-serif"
<span style="font-size:11pt; font-family:"Arial","sans-serif" If the digit entered is not one of the valid digits or valid letters, return â1 by value indicating that you have an invalid digit.
<span style="font-size:11pt; font-family:"Arial","sans-serif"

Make ReadDials() return â2 in this case. Also a phone number never begins with 555, so the program should flag an error if such a number is entered.
Make ReadDials() return â3 in this case. A phone number always has a hyphen (-) in the 4th position.
Make ReadDials() return â4 if it doesnt have a hyphen in the 4th position.
If a hyphen is in any other position, it is considered an invalid digit.
If the phone number is valid, main calls the AcknowledgeCall function to write the converted number to the output file.


ReadDials(), and AcknowledgeCall(). The ToDigits() function is called from the ReadDials() function and is used to convert each letter entered individually to a digit and to verify the user has entered a valid phone number.
Have the program work for any number of phone numbers.
Continue processing until the user enters a Q.


function to convert any letters entered to uppercase.
All error messages are to be written to the output file from main() based on the return value from the functions.
<span style="font-size:11pt; font-family:"Arial","sans-serif"
<span style="font-size:11pt; font-family:"Arial","sans-serif" You will set up the 8 char variables to hold the digits of the phone number in main() and pass the variables to the functions by reference.
<span style="font-size:11pt; font-family:"Arial","sans-serif"
<span style="font-family:"Arial","sans-serif" Sample Output from the Program:
<span style="font-family:"Arial","sans-serif"
<span style="font-family:"Arial","sans-serif" Enter a phone number (Q to quit): 213-2121
<span style="font-family:"Arial","sans-serif" Phone Number Dialed: 213-2121
<span style="font-family:"Arial","sans-serif"
<span style="font-family:"Arial","sans-serif" Enter a phone number (Q to quit): asc-dfer
<span style="font-family:"Arial","sans-serif" Phone Number Dialed: 272-3337
<span style="font-family:"Arial","sans-serif"
<span style="font-family:"Arial","sans-serif" Enter a phone number (Q to quit): 555-resw
<span style="font-family:"Arial","sans-serif" ERROR - Phone number cannot begin with 555
<span style="font-family:"Arial","sans-serif"
<span style="font-family:"Arial","sans-serif" Enter a phone number (Q to quit): 098-8765
<span style="font-family:"Arial","sans-serif" ERROR - Phone number cannot begin with 0
<span style="font-family:"Arial","sans-serif"
<span style="font-family:"Arial","sans-serif" Enter a phone number (Q to quit): 12345678
<span style="font-family:"Arial","sans-serif" ERROR - Hyphen is not in the correct position
<span style="font-family:"Arial","sans-serif"
<span style="font-family:"Arial","sans-serif" Enter a phone number (Q to quit): @34-*uyt
<span style="font-family:"Arial","sans-serif" ERROR - An invalid character was entered
<span style="font-family:"Arial","sans-serif"
<span style="font-family:"Arial","sans-serif" Enter a phone number (Q to quit): Q

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Declare the char variables for the 8 digits of the phone number

Call the ReadDials function passing the 8 digits 
by reference. ReadDials returns an error code by 
value.
<span style="font-size:11pt; font-family:"Arial","sans-serif" If the return value is -5, exit the do while loop

 error message "ERROR - An invalid character was entered". 
If the error code is -2, display the 
 error message "ERROR - Phone number cannot begin with 0". 
If the error code is -3, display the 
 error message "ERROR - Phone number cannot begin with 555". 
If the error code is -4, display the 
 error message "ERROR - Hyphen is not in the correct position". 
Otherwise, call the AcknowledgeCall function

 End-While

If a Q was entered, return -5. 
Input the rest of the phone number

 not for digit 4 
If ToDigit returns -1, return -1 
If digit 4 is not a hyphen, return -4. 
If digit 1 is 0, return -2. 
If digits 1 - 3 are 5, return -3 
Otherwise, return 0

Convert the digit to upper case 
Use a switch statement to determine if the digit is valid 
 and convert the letters to digits

If the digit is valid, return 0.

 Display the Phone Number.
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This is what I have so far :
# include <iostream> 
 
# include <string> 
 
# include <cctype> 
 
# include <iomanip> 
 
using namespace std; 
 
// prototypes 
 
int ReadDial (char &d1, char &d2, char &d3, char &d4, char &d5,char &d6, char &d7, char &d8); 
 
char Todigit(char &d); 
 
void AcknowledgeCall(char d1, char d2, char d3, char d4, char d5, char d6, char d7, char d8); 
 
 
 
// function main 
 
int main() 
 
{ 
 
char d1, d2, d3, d4, d5, d6, d7, d8; 
 
int returnValue = 0; 
 
while (returnValue != -5) 
 
{ 
 
returnValue = ReadDial (d1, d2, d3, d4, d5, d6, d7, d8); 
 
switch (returnValue) 
 
{ 
 
case -1: cout << "Error- An invalid character was entered" << endl; break; 
 
case -2: cout << "Error- Phone number cannot begin with 0" << endl; break; 
 
case -3: cout << "Error- Phone number cannot begin with 555" << endl; break; 
 
case -4: cout << "Error- Hyphen is not in the correct position" << endl; break; 
 
default: AcknowledgeCall (d1, d2, d3, d4, d5, d6, d7, d8); 
 
} 
 
} 
 
 
 
return 0; 
 
} 
 
 
 
// function ReadDial 
 
int ReadDial (char &d1, char &d2, char &d3, char &d4, char &d5, char &d6, char &d7, char &d8) 
 
{ 
 
int returnValue; 
 
cout << "Enter a phone number (Q to quit): "; 
 
cin >> d1; 
 
if(d1 == Q) return -5; 
 
cin >> d2 >> d3 >> d4 >> d5 >> d6 >> d7 >> d8; 
 
returnValue = Todigit(d1); 
 
if (returnValue == -1) 
 
return returnValue; 
 
returnValue = Todigit(d2); 
 
if (returnValue == -1) 
 
return returnValue; 
 
returnValue = Todigit(d3); 
 
if (returnValue == -1) 
 
return returnValue; 
 
if (d4 != -) 
 
return -4; 
 
returnValue = Todigit(d5); 
 
if (returnValue == -1) 
 
return returnValue; 
 
returnValue = Todigit(d6); 
 
if (returnValue == -1) 
 
return returnValue; 
 
returnValue = Todigit(d7); 
 
if (returnValue == -1) 
 
return returnValue; 
 
returnValue = Todigit(d8); 
 
if (returnValue == -1) 
 
return returnValue; 
 
if (d1 == 0) 
 
return -2; 
 
if (d1 == 5 && d2 == 5 && d3 == 5) 
 
return -3; 
 
return 0; 
 
 
 
} 
 
 
 
 
 
//function ToDigit 
 
 
 
char Todigit(char &d) 
 
{ 
 
d = toupper(d); 
 
switch(d) 
 
{ 
 
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 8: case 9: break; 
 
case A: case B: case C: d = 2; break; 
 
case D: case E: case F: d = 3; break; 
 
case G: case H: case I: d = 4; break; 
 
case J: case K: case L: d = 5; break; 
 
case M: case N: case O: d = 6; break; 
 
case P: case Q: case R: case S: d = 7; break; 
 
case T: case U: case V: d = 8; break; 
 
case W: case X: case Y: case Z: d = 9; break; 
 
default: return -1; 
 
} 
 
} 
 
 
 
 
 
// function AcknowledgeCall 
 
void AcknowledgeCall(char d1, char d2, char d3, char d4, char d5, char d6, char d7, char d8) 
 
{ 
 
 
 
 
cout << "Phone Number Dialed: " << d1 << d2 << d3 << d4 << d5 << d6 << d7 << d8 << endl << endl; 
 
}
I dont know what else to do and it is do today. Thanks

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help with basic c++ function homework problem

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