C连载27-练习计算和数据类型

一、练习计算和数据类型

#include<stdio.h>
#pragma warning(disable:4996)
const int S_PER_M = 60;    //1分钟的秒数
const int S_PER_H = 3600;  //1小时的秒数
const double M_PER_K = 0.62137;  //1公里的英里数
int D27_1_running(void) {
	double distk, distm;     //跑过的距离（分别用以公里和英里为单位）
	double rate;            //平均速度（以英里/小时为单位）
	int min, sec;           //跑步用时（以分钟和秒为单位）
	int time;               //跑步用时（以秒为单位）

	double mtime;           //跑1英里需要的时间，以秒为单位
	int mmin, msec;         //跑1英里需要的时间，以分钟和秒为单位

	printf("This program converts your time for a metric race\n");
	printf("to a time for running a mile and to your average\n");

	printf("speed in miles per hour.\n");
	printf("Please enter, in kilometers,the distance run.\n");
	scanf("%lf", &distk);     //%lf表示读取double类型的值
	printf("Next enter the time in minute and seconds.\n");
	printf("Begin by entering the minutes.\n");
	scanf("%d", &min);
	printf("Now enter the seconds.\n");
	scanf("%d", &sec);
	
	time = S_PER_M * min + sec;    //把时间转换成秒
	distm = M_PER_K * distk;       //公里换成英里
	rate = distm / time *  S_PER_H;  //英里/秒 * 秒/小时  = 英里/小时
	mtime = (double)time / distm;   //时间/距离 = 跑1英里的所用的时间
	mmin = (int)mtime / S_PER_M;   //求出分钟数
	msec = (int)mtime % S_PER_M;    //求出剩余的秒数

	printf("You ran %1.2f km (%1.2f miles) in %d min,%d sec.\n", distk, distm, min, sec);
	printf("That pace corresponds to running a mile in %d min, ", mmin);
	printf("%d sec.\nYour average speed was %1.2f mph.\n", msec, rate);

	return 0;
}

二、源码：

• D27_1_running.c
• https://github.com/ruigege66/CPrimerPlus/blob/master/D27_1_running.c
• CSDN：https://blog.csdn.net/weixin_44630050
• 博客园：https://www.cnblogs.com/ruigege0000/
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