C Primer Plus10-1

/*1．修改程序清单 10.7 中的程序 rain，使它不使用数组下标，而是使用指针进行计算（程序中仍然需要声明并初始化数组）。*/#include<stdio.h>#include<stdlib.h>#define MONTHS 12#define YEARS 5int main() {     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 (month = 0, subtot = 0; month < MONTHS; month++)              subtot += *(*(rain + year) + month);          printf("%5d %15.1f\n", 2000 + year, subtot);          total += subtot;      }     printf("\nThe yearly average is %.1f inches.\n\n", total / YEARS);     printf("MONTHLY AVERAGES: \n\n");     printf(" Jan  Feb  Mar  Apr  May  Jun  Jul  Aug  Sep  Oct  ");     printf("Nov  Dec\n");     for (month = 0; month < MONTHS; month++)      {          for (year = 0, subtot = 0; year < YEARS; year++)              subtot += *(*(rain + year) + month);          printf("%4.1f ", subtot / YEARS);      }     printf("\n");     system("pause");     return 0;}