c - 我想用Visual Studio做一个 parking 收费程序

Question

    int min1, min2, won;

    printf("parking minutes(분)? ");
    scanf("%d", &min1);

    min2 = (min1 - 30) % 10;

    if (min1 <= 39) 
        won = 2000;
    else {
        if (min2 = 0)
            won = 2000 + 1000 * (min1 - 30) % 10;
        else
            won = 2000 + 1000 * (min1 - min2 - 20) % 10;
    }
    printf("parking fee: %d", won);

该计划的条件

1. 直到30分钟，2000韩元
2. 30分钟后，每10分钟1000韩元
3. 每天最多 25000 韩元
4. parking 时间不能超过 24 小时

我以为'%'表示余数，所以我就这样写，但是当我输入52时，结果显示5200!我想让结果为 5000。我想知道对于条件 3 和 4 该怎么办。我能做什么？我应该使用“for”和“sum”吗？

Answer 1

让我们按照与作业相同的顺序对步骤进行编程:

int min1, min2, won;

printf("parking minutes(분)? ");
if (scanf("%d", &min1) != 1) {
    printf("invalid input\n");
    return 1;   // invalid input.
}

won = 2000; // 1. until 30min, 2000won, minimum price
if (min1 > 30) {
    // 2. after 30min, 1000won per 10min
    min2 = min1 - 30;  // minutes after 30
    // add 1000won for every slice or 10min or portion thereof
    won += ((min2 + 9) % 10) * 1000;
    // 3. max 25000won per a day
    if (won > 25000)
        won = 25000;
}
// 4. parking minutes cannot be over than 24 hours
if (min1 > 24 * 60) {
    // reject request
    printf("parking time exceeds 24 hours\n");
} else {
    printf("parking fee: %d\n", won);
}