move the star by pressing w, a, s ,d

move_star.c

#include <stdio.h>
#include <stdlib.h>

#if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__)
#define clearConsole system("cls")
#define get_char _getch()
#include <conio.h>
#include <time.h>
#include <windows.h>

typedef char bool;
#define false 0
#define true 1

#define DELTA_EPOCH_IN_MICROSECS  11644473600000000ULL

struct timezone {
    int tz_minuteswest;
    int tz_dsttime;
};

int gettimeofday(struct timeval *tv, struct timezone *tz) {
    FILETIME ft;
    unsigned __int64 tmpres = 0;
    static int tzflag = 0;
    if (NULL != tv) {
        GetSystemTimeAsFileTime(&ft);
        tmpres |= ft.dwHighDateTime;
        tmpres <<= 32;
        tmpres |= ft.dwLowDateTime;
        tmpres /= 10;
        tmpres -= DELTA_EPOCH_IN_MICROSECS; 
        tv->tv_sec = (long) (tmpres / 1000000UL);
        tv->tv_usec = (long) (tmpres % 1000000UL);
    }
    if (NULL != tz) {
        if (!tzflag) {
            _tzset();
            tzflag++;
        }
        tz->tz_minuteswest = _timezone / 60;
        tz->tz_dsttime = _daylight;
    }
    return 0;
}

#else
#define clearConsole system("clear")
#define get_char getchar()
#include <stdbool.h>
#include <sys/time.h>
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>

int _kbhit() {
    struct termios oldt, newt;
    int ch;
    int oldf;
    tcgetattr(STDIN_FILENO, &oldt);
    newt = oldt;
    newt.c_lflag &= ~(ICANON | ECHO);
    tcsetattr(STDIN_FILENO, TCSANOW, &newt);
    oldf = fcntl(STDIN_FILENO, F_GETFL, 0);
    fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);
    ch = getchar();
    tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
    fcntl(STDIN_FILENO, F_SETFL, oldf);
    if(ch != EOF) {
        ungetc(ch, stdin);
        return 1;
    }
    return 0;
}

#endif

int x;
int y;
int fps;
int cnt;
double last_frame;
bool exit_flag;

double double_time() {
    struct timeval time;
    gettimeofday(&time, NULL);
    return time.tv_sec + (time.tv_usec / 1000000.0);
}

void frame() {
    int i, j;
    last_frame = double_time();
    clearConsole;
    for (j = 0; j < 10; ++j) {
        for (i = 0; i < 10; ++i) {
            if (i == x && j == y)
                printf("*");
            else
                printf(".");
            printf(" ");
        }
        printf("\n");
    }
}

void input() {
    int ch;
    if (_kbhit()) {
        switch (get_char) {
        case 27:
            if (!_kbhit()) { //esc
                exit_flag = true;
                break;
            }
            else if (get_char == 91) { //arrow key in mac terminal
                switch (ch = get_char) {
                case 65: //up
                    --y;
                    break;
                case 66: //down
                    ++y;
                    break;
                case 68: //left
                    --x;
                    break;
                case 67: //right
                    ++x;
                    break;
                default:
                    printf("%i\n", ch);
                    exit_flag = true;
                    break;
                }
            }
            break;
        case 'w':
            --y;
            break;
        case 's':
            ++y;
            break;
        case 'a':
            --x;
            break;
        case 'd':
            ++x;
            break;
        case 'q':
            exit_flag = true;
            break;
        }
    }
}

void loop() {
    input();
    if ((double_time() - last_frame) > (1.0 / (double) fps))
        frame();
}

int main() {
    cnt = 0;
    x = y = 0;
    fps = 24;
    while (!exit_flag)
        loop();
    return 0;
}