C语言运算符表达式语句综合实例 C语言带参数的函数实例 C语言循环实例 C语言运算符表达式语句综合实例 // running.c -- A useful program for runners #include <stdio.h> const int S_PER_M = 60; // seconds in a minute const int S_PER_H = 3600; // seconds in an hour const double M_PER_K = 0.62137; // miles in a kilometer int main(void) { double distk, distm; // distance run in km and in miles double rate; // average speed in mph int min, sec; // minutes and seconds of running time int time; // running time in seconds only double mtime; // time in seconds for one mile int mmin, msec; // minutes and seconds for one mile 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 for type double printf("Next enter the time in minutes and seconds.\n"); printf("Begin by entering the minutes.\n"); scanf("%d", &min); printf("Now enter the seconds.\n"); scanf("%d", &sec); // converts time to pure seconds time = S_PER_M * min + sec; // converts kilometers to miles distm = M_PER_K * distk; // miles per sec x sec per hour = mph rate = distm / time * S_PER_H; // time/distance = time per mile mtime = (double) time / distm; mmin = (int) mtime / S_PER_M; // find whole minutes msec = (int) mtime % S_PER_M; // find remaining seconds 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; } C语言带参数的函数实例 C语言循环实例