C primer plus 第十章练习1：-优快云博客

本文链接：https://blog.youkuaiyun.com/qcx1221/article/details/51570319

本文展示了一个使用C语言编写的程序，该程序利用二维数组记录了2000年至2004年间每个月的降水量，并计算了每年的总降水量及平均降水量，同时还计算了每个月的平均降水量。

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#include <stdio.h>
#define MONTHS 12
#define YEARS 5
int main(void)
{
    // 把数组初始化为2000年到2005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 },
        { 8.5,8.2,1.22,1.6,2.4,0.0,5.2,0.9,0.3,0.9,1.4,7.3 },
        { 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];              //更改为不使用下标而是用指针
            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  Nov  Dec\n");

    for (month = 0; month < MONTHS; month++)
    {
        for (year = 0, subtot = 0; year < YEARS; year++)
//          subtot += rain[year][month];            //更改为不使用下标而是用指针
        subtot += *(*(rain + year)+ month);
        printf("%4.1f ", subtot / YEARS);
    }
    printf("\n");
    return 0;
}