Thread: How to manipulate a string

I need to input a phone number in the exact form (555) 555-5555 and using the strtok, extract the area code as a token which I have started like this

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void main()
{
    
     char pNum[15];
     char *tokenPtr;
     printf("Enter a phone number is this format (555) 555-5555: ");
     gets(pNum);
     *tokenPtr = strtok(pNum, " ");

which extracts the area code, but this is where I get stuck. I need to convert the area code to an integer variable, then extract the first three digits, (save that string), and the last 4. Concatenate the 7 numbers, then convert to a long variable.

Print the labeled 3 digit area code as the integer(without any other characters). Then print the labeled 7 numbers as a long(without any other characters).

Can anyone help???

Code tags added by kermi3

Thank you Kermi!

I was wondering why my code didn't look the same after I posted the message than the way I had originally typed it.

this might help a little, it will convert a string to a long, extracting only numbers and leaving everything else out:

Code:

long stringtolong(char tempstr[])
{
  long templong=0;
  int counter;

  for(counter=0;tempstr[counter]!='\0';counter++)
    if(tempstr[counter]>='0' && tempstr[counter]<='9')
      templong = templong*10 + tempstr[counter]-'0';
  return templong;
}

P.S. if you want the first 3 digits then the next two, then change the function to allow parsing of start/finish points, ie:

Code:

long firstchars;
long restchars;

long stringtolong(char tempstr[],int start, int end)
{
  long templong=0;
  int counter;

  for(counter=start;counter<=end;counter++)
    if(tempstr[counter]>='0' && tempstr[counter]<='9')
      templong = templong*10 + tempstr[counter]-'0';
  return templong;
}

firstchars = stringtoolong(phonenumber,0,2);
restchars = stringtoolong(phonenumber,3,strlen(phonenumber));

the firstchars should have only the first 3 numbers and the restchars should have all the rest.

Hope this helps