Computer Science 2611
Summer 1999
Laboratory Assignment 12

Suppose that a file has been prepared containing names and telephone numbers. Each line contains a name (without any spaces) followed by a telephone number (without any spaces). For example, the file might be as follows.

Chuckie	111-2233
Angelica	662-1111
Tommy	111-4441
Phil	221-7654
Lil	221-4567

Your program should start by prompting for the name of the file that contains this data. Then it should read the file into two arrays, one that holds the names and the other that holds the telephone numbers. It should then ask for a name, and should print the corresponding telephone number. It should continue asking for names, and showing telephone numbers, until the string quit is typed. So a session with this program might look like this.

  What is the name of the telephone number file?  phone.txt
  
  What name shall I look up?  Angelica
  The number for Angelica is 662-1111
  
  What name shall I look up? Tommy
  The nuber for Tommy is 111-4441
  
  What name shall I look up? quit

Hints

1. Assume that names and phone numbers are no more than 15 characters long.
2. The names and numbers should each be stored as an array of strings. That is, each thing in the array is an array of characters. You can create an array of 100 entries, with each entry being a string of length at most 15 as follows.

           char names[100][16];
     

   Similarly, you can create an array to hold the numbers, by

           char numbers[100][16];
     

   Note that 16 bytes are allowed for each name, to account for the null terminator. names[0] is an array of characters, 16 bytes long, as is names[1], etc.

   Be careful to keep track of how many entries in the names table are actually in use. When you search for a name, you do not want to look at part of the names array that has no information in it.

   When you look up a name, and find it at index $k$ in the names array, you should find the corresponding number at same index $k$ in the numbers array.

3. After you open the file that contains the data, be sure to check whether the file exists. If it does not, your program should report that there is no such file.

   To read the names and phone numbers, just read strings using >>. If you put the read in a test, you can tell whether anything was available to read. You can write, for example,

        while(infile >> names[k]) 
     

4. You will need to ask whether two strings are equal. Do not use operator == to test strings for equality. To ask whether null-terminated strings A and B are equal, use

          if(strcmp(A,B) == 0)
     

   strcmp(A,B) is 0 if strings A and B are the same. To use function strcmp, you need to include header file string.h.