Program to tabulate a survey data

Program 30) A survey to know the popularity of four cars (Ambassador, Fiat, Dolphin and Maruti) was conducted in four cities(Bombay, Calcutta, Delhi and Madras). Each person surveyed was asked to give his city and the type of the car he was using. The results form, are tabulated as follows:
 M    1     C     2     B     1     D     3     M     2     B     4
 C     1     D     3    M     4     B     2     D     1     C     3
 D     4     D     4    M     1     M    1     B     3      B     3
 C     1     C     1    C     2     M     4     M    4      C     2
 D     1     C     2    B     3     M     1     B     1      C    2
 D     3     M    4    C     1      D     2     M     3     B    4

Codes represent the following information:
            M - Madras             1 - Ambassador
            D - Delhi                 2 - Fiat
            C - Calcutta            3 - Dolphin
            B - Bombay            4 - Maruti 
Write a program to produce a table showing popularity of various cars in four cities.

A two dimensional array frequency is used as an accumulator to store the number of cars used, under various categories in each city. For example, the element frequency [i] [j] denotes the number of cars of type j used in city i. The frequency is declared as an array of size 5 x 5 and all the elements are initialized  to zero.
This program reads the city code , one set after another, from the terminal. Tabulation ends when the letter X is read in place of a city code.


                                      PROGRAM

main ( )
 {
     int i, j, car ;
     int frequency [5] [5] = {  {0}, {0}, {0}, {0}, {0}  } ;
     char city ;
     printf ("For each person, enter the city code \n") ;
     printf ("followed by the car code. \n") ;
     printf ("Enter the letter X to indicate end.\n") ;
   /*      TABULATION BEGINS      */
     for (i = 1; i < 100; i++)
     {
        scanf ("%c", &city) ;
        if (city == 'X') ;
           break ;
        switch (city)
        {
                  case 'B'   :    frequency [1] [car]++ ;
                                       break ;
                  case 'C'   :    frequency [2] [car]++ ;
                                       break ;
                  case 'D'   :    frequency [3] [car]++ ;
                                       break ;
                  case 'M'  :    frequency [4] [car]++ ;
                                      break ;
         }
     }
  /*TABULATION COMPLETED AND PRINTING BEGINS*/
     printf ("\n\n") ;
     printf ("   POPULARITY TABLE\n\n") ;
     printf ("______________________\n") ;
     printf (" City Ambassador Fiat Dolphin Maruti   \n") ;
     printf ("______________________\n") ;
     for (i = 1; i <= 4; i++)
     {
               switch (i)
               {
                          case 1 : printf ("Bombay      ") ;
                               break ;
                          case 2 :  printf ("Calcutta      ") ;
                               break ;
                          case 3 : printf (" Delhi          ") ;
                               break ;
                          case 4 : printf ("Madras         ") ;
                 }
                 for (j = 1; j <=4; j++)
                     printf ("%7d", frequency [i] [j]) ;
                printf ("\n") ;
        }
        printf ("___________________________\n") ;
  /*              PRINTING ENDS             */
 }


Output:       For each person, enter the city code
                   followed by the car code.

                   Enter the letter  X to indicate end     

                   M 1  C  2   B   1   D   3   M   2   B   4

                   C  1  D  3  M   4   B   2   D   1   C   3

                   D  4  D  4  M   1   M  1   B   3   B    3

                   C  1  C  1  C   2   M   4   M  4   C   2

                   D  1  C  2  B   3   M   1   B   1   C   2

                   D  3  M  4  C  1    D   2   M  3   B   4     x

                        POPULARITY TABLE

__________________________________________________

   City           Ambassador      Fiat         Dolphin     Maruti

   Bombay        2                      1                3                2

   Calcutta        4                      5                1                0

   Delhi             2                      1                3                2

   Madras         4                      1                1                4

__________________________________________________