如何在一定范围内增加或减少

如何解决如何在一定范围内增加或减少

我正在尝试添加数字，但要保持在一定范围内。如果它越过边界或越过边界，它将绕回另一个边界。

示例：

最小值：10 最多：50

• 20 + 10 = 30
• 20 + 30 = 50（或0 idrk）
• 20 + 31 = 1
• 40 + 20 = 10
• 40 + 70 = 10
• 40-10 = 30
• 10-30 = 30
• 10-20 = 40
• 10-70 = 40

我正在寻找两个函数，一个要加，一个要减。我并不在乎哪种语言，但首选python或java。感谢您的帮助！

解决方法

恐怕我们必须为您的问题添加更多具体信息：

• 边界是包容性的还是排他性的？
• 我们是在谈论整数还是浮点数？

如果您想将例程用作多种用途的库函数，则最好将一端定义为包含，而将另一端定义为排斥。

以下（不完整的）Java程序显示了解决的方向以及边界问题：只要碰到边界，它就会翻转到值框架的另一端：

public class FramedAddSub {

int min;
int max;
int value;

public FramedAddSub(int min,int max,int value) {
    this.min = min;
    this.max = max;
    this.value = value;
}

public FramedAddSub add(int toAdd) {
    final int diff = max - min;

    if (toAdd >= 0) {
        // step 1: norm to zero
        value -= min;

        // step 2: rest of division
        value = (value + toAdd) % diff;

        // step 3: re-norm to old offset
        value += min;
    } else {
        // step 1: norm to zero from other end
        value -= max;
        
        // step 2:
        value = (value + toAdd) % diff;
        
        // step 3: re-norm back
        value += max;
    }

    return this;
}

public static void main(String[] args) {
    FramedAddSub test = new FramedAddSub(20,50,20);

    System.out.println("start: " + test.value);
    test.add(10);
    System.out.println("+10: " + test.value);
    test.add(20);
    System.out.println("+20: " + test.value);
    test.add(1);
    System.out.println("+1: " + test.value);
    test.add(30);
    System.out.println("+30 should just turn around circle: " + test.value);
    test.add(-1);
    System.out.println("-1: " + test.value);
    test.add(-1);
    System.out.println("-1: " + test.value);
    test.add(-30);
    System.out.println("-30 should just turn around circle: " + test.value);

 }
}

,

在python中尝试：

ans = abs(a + b) % 50 

如果要进行减法运算，则需要将a和b传递为负数。

,

# define the range
start = 0
end = 93

#  this function accepts positive and negative numbers in x
def mover(current_place,x):
    locate = current_place + x
    locate = locate % (end-start) # if x > the range
    if locate > end:
        locate = locate - end
    if locate < start:
        locate = locate + end
    return locate


if __name__ == "__main__":
    current_place = 50
    print(current_place) #50
    current_place = mover(current_place,10)
    print(current_place) #60
    current_place = mover(current_place,-20)
    print(current_place) #40
    current_place = mover(current_place,-50)
    print(current_place) #83
    current_place = mover(current_place,220)
    print(current_place) #24