修改下面程序中的程序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）。
/* rain.c -- 针对若干年的降水量数据，计算年降水总量、年降水平均量，以及月降水平均量 */
#include <stdio.h>
#define MONTHS 12 // 一年的月份数
#define YEARS 5 // 降水量数据的年数
int main(void)
{
// 把数组初始化为2000到2004年的降水量数据
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++)
{ // 对于每一年，各月的总降水量
for(month = 0, subtot = 0; month < MONTHS; month++)
subtot += rain[year][month];
printf("%5d %15.1f\n", 2000 + year, subtot);
total += subtot; // 所有年度的总降水量
}
printf("\nThe yearly average is %.1f inches.\n\n", total/TEARS);
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++)
{ // 对于每个月，各年该月份的总降水量
for(year = 0; subtot = 0; year < YEARS; year++)
subtot += rain[year][month];
printf("%4.1f ", subtot/YEARS);
}
printf("\n");
return 0;
}
#include <stdio.h> #define MONTHS 12 // number of months in a year #define YEARS 5 // number of years of data int main(void) { // initializing rainfall data for 2000 - 2004 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 %15.1f\n", 2000 + year, subtot); total += subtot; // total for all years } 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 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; }