Arrays

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 car he was using. The results, in coded 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
D1 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.

#include <stdio.h>
void 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;
   scanf("%d", &car );
   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    ") ;
     break ;
   }
   for( j = 1 ; j <= 4 ; j++ )
      printf("%7d", frequency[i][j] ) ;
   printf("\n") ;
       }
       printf("-------------------------------------------\n");
    /*. . . . . . . . . PRINTING ENDS. . . . . . . . . . .*/
       getch();
   }