TC学习记录之——毫秒计时，方向键控制字符下落速度

C/C++ code

#include <time.h>#define upkey 72#define downkey 80#define addkey '+'#define subkey '-'#define spacekey ' '#define esckey 27/*#define CLK_TCK CLOCKS_PER_SEC*/signed float mysleep(signed float delay){ float time_start, time_end; time_start = clock(); time_end = clock(); if (delay < 0) {  printf("value overflow\n");  delay = 0; } while ((time_end - time_start) / CLK_TCK < delay) {  time_end = clock(); } return delay;}void mygotoxy(int x, int y){ system("cls"); while (y--) {  printf("\n"); } while (x--) {  printf(" "); }}main(){ float time_i = 1; int key, x = 10, y = 1, symbol; while (1) {  while (y <= 15)  {   while (kbhit())   {    key = getch();    switch (key)    {    case upkey:     time_i = time_i - 0.1;     if (time_i <= 0)      time_i = 0;     break;    case downkey:     time_i = time_i + 0.1;     break;    case addkey:     time_i = time_i - 0.1;     if (time_i <= 0)      time_i = 0;     break;    case subkey:     time_i = time_i + 0.1;     break;    case spacekey:     time_i = 1;     break;    case esckey:     exit(0);    }   }   mygotoxy(x, y++);   printf("$");   mysleep(time_i);  }  y = 1;  mygotoxy(x, y); }}