Modify the rain program in L isting   10.7    so that it does the calculations using pointers instead of subscripts. (You still have to declare and initialize the array.)

10.7

Listing 10.7   The  rain.c  Program   /* rain.c  — finds yearly totals, yearly average, and monthly                   average for several years of rainfall data */  #include   #define MONTHS 12    // number of months in a year  #define YEARS   5    // number of years of data  int main(void)  {   // initializing rainfall data for 2010 – 2014      const float rain[YEARS][MONTHS] =      {          {4.3,4.3,4.3,3.0,2.0,1.2,0.2,0.2,0.4,2.4,3.5,6.6},          {8.5,8.2,1.2,1.6,2.4,0.0,5.2,0.9,0.3,0.9,1.4,7.3},          {9.1,8.5,6.7,4.3,2.1,0.8,0.2,0.2,1.1,2.3,6.1,8.4},          {7.2,9.9,8.4,3.3,1.2,0.8,0.4,0.0,0.6,1.7,4.3,6.2},          {7.6,5.6,3.8,2.8,3.8,0.2,0.0,0.0,0.0,1.3,2.6,5.2}      };      int year, month;      float subtot, total;        printf(” YEAR    RAINFALL  (inches)n”);      for (year = 0, total = 0; year < YEARS; year++)      {             // for each year, sum rainfall for each month          for (month = 0, subtot = 0; month < MONTHS; month++)              subtot +=  rain[year][month];          printf(“%5d %15.1fn”, 2010 + year, subtot);          total += subtot; // total for all years       }      printf(“nThe yearly average is %.1f inches.nn”,              total/YEARS);      printf(“MONTHLY AVERAGES:nn”);      printf(” Jan  Feb  Mar  Apr  May  Jun  Jul  Aug  Sep  Oct “);      printf(” Nov  Decn”);        for (month = 0; month < MONTHS; month++)      {             // for each month, sum rainfall over years          for (year = 0, subtot =0; year < YEARS; year++)              subtot += rain[year][month];          printf(“%4.1f “, subtot/YEARS);      }      printf(“n”);        return 0;  }  

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