用dosbox写 体育比赛计时器，有记忆的功能，程序运行开始计时，屏幕显示00:00:00

好的，我可以为您提供一些思路和代码示例。

首先，您可以使用 DOSBox 中的 Turbo C++ 编译器来编写程序。以下是示例代码：

#include <dos.h>
#include <stdio.h>
#include <conio.h>

#define BASE 1000
#define TICKS_PER_SECOND 18.2

void interrupt (*oldtimer)();
void interrupt newtimer();

int main()
{
    int hours = 0, minutes = 0, seconds = 0;
    int last_hours = 0, last_minutes = 0, last_seconds = 0;
    int memory_hours = 0, memory_minutes = 0, memory_seconds = 0;
    int running = 1;

    clrscr();
    printf("Press any key to start the timer");
    getch();

    // Set up the new timer interrupt
    oldtimer = getvect(0x08);
    setvect(0x08, newtimer);

    // Main loop
    while (running) {
        if (kbhit()) {
            // Stop the timer if a key is pressed
            running = 0;
        }

        if (last_seconds != seconds) {
            // Update the display every second
            gotoxy(1, 2);
            printf("%02d:%02d:%02d", hours, minutes, seconds);
            last_hours = hours;
            last_minutes = minutes;
            last_seconds = seconds;
        }

        // Sleep for a short while to avoid using too much CPU
        delay(10);
    }

    // Save the current time to memory
    memory_hours = hours;
    memory_minutes = minutes;
    memory_seconds = seconds;

    // Restore the old timer interrupt
    setvect(0x08, oldtimer);

    clrscr();
    printf("Press any key to show the saved time");
    getch();

    // Display the saved time
    gotoxy(1, 2);
    printf("%02d:%02d:%02d", memory_hours, memory_minutes, memory_seconds);

    getch();
    return 0;
}

void interrupt newtimer()
{
    static unsigned long ticks = 0;

    ticks += BASE;

    if (ticks >= TICKS_PER_SECOND) {
        ticks -= TICKS_PER_SECOND;

        // Increment the timer
        seconds++;
        if (seconds >= 60) {
            seconds = 0;
            minutes++;
            if (minutes >= 60) {
                minutes = 0;
                hours++;
            }
        }
    }

    // Call the old timer interrupt
    (*oldtimer)();
}

这段代码实现了一个简单的计时器，每秒更新一次屏幕上的时间显示。当用户按下任意键时，程序将停止计时并将当前时间保存到内存中。当用户按下任意键时，程序将显示保存的时间。

注意这只是一个简单的示例程序，您可能需要根据实际需要进行更改和优化。