Question

我需要开发一种算法来计算机票的价格。首先，用户必须输入价格，座位位置（Upper = 30％off，Middle = regular，Lower = 25％premium）和客户类型（Senior = 10％off，Adult = regular）。

所以样本测试：用户输入50表示价格，上限表示位置，高级表示客户类型，最终票价应为31.50。

到目前为止，我的算法让我35。有人能找到我的错误吗？

    if (cusType.charAt(0) == 'A'){
        ticPrice = regTicPrice;

        if (location.charAt(0) == 'U'){
            ticPrice = regTicPrice * 0.7;
        }
        else if (location.charAt(0) == 'L'){
            ticPrice = regTicPrice * 1.25;
        }
        else if (location.charAt(0) == 'M'){
            ticPrice = regTicPrice;
        }
    }

    else if (cusType.charAt(0) == 'S'){
        ticPrice = regTicPrice * 0.9;

        if (location.charAt(0) == 'U'){
            ticPrice = regTicPrice * 0.7;
        }
        else if (location.charAt(0) == 'L'){
            ticPrice = regTicPrice * 1.25;
        }
        else if (location.charAt(0) == 'M'){
            ticPrice = regTicPrice;
        }
    }
    else{
     ticPrice = 0;   
    }

Answer 1

使用HashMap让您的生活更简单，就像这样：

HashMap customerTypeDiscount = new HashMap<String, Double>();
customerTypeDiscount.put("Adult", 1);
customerTypeDiscount.put("Senior", 0.9);

HashMap locationDiscount = new HashMap<String, Double>();
locationDiscount.put("Upper", 0.7);
locationDiscount.put("Middle", 1);
locationDiscount.put("Lower", 1.25);

ticPrice = regTicPrice * ((Double) customerTypeDiscount.get(cusType)) * (((Double) locationDiscount.get(location));

Answer 2

您的问题与更新ticPrice有关，但在成为高级会员后从不重复使用更新的ticPrice。

你最终为“U”而不是50 * .9 * .7。

做50 * .7

if (cusType.charAt(0) == 'A'){
    ticPrice = regTicPrice;

    if (location.charAt(0) == 'U'){
        ticPrice = ticPrice * 0.7;
    }
    else if (location.charAt(0) == 'L'){
        ticPrice = ticPrice * 1.25;
    }
    else if (location.charAt(0) == 'M'){
        // you don't technically need this if statement at the end since it doesnt change
        ticPrice = ticPrice;
    }
}

else if (cusType.charAt(0) == 'S'){
    ticPrice = ticPrice * 0.9;

    if (location.charAt(0) == 'U'){
        ticPrice = ticPrice * 0.7;
    }
    else if (location.charAt(0) == 'L'){
        ticPrice = ticPrice * 1.25;
    }
    else if (location.charAt(0) == 'M'){
        // you dont technically need this if statement at the end since it doesnt change
        ticPrice = ticPrice;
    }
}
else{
 ticPrice = 0;   
}

Answer 3

您在计算机票折扣价时使用的是实际票价，请使用内部的ticPrice而不是下面的regTicPrice：

   if (cusType.charAt(0) == 'A'){
    ticPrice = regTicPrice;
    if (location.charAt(0) == 'U'){
        ticPrice = ticPrice * 0.7;
    }
    else if (location.charAt(0) == 'L'){
        ticPrice = ticPrice * 1.25;
    }
    else if (location.charAt(0) == 'M'){
        ticPrice = ticPrice;
    }
}

else if (cusType.charAt(0) == 'S'){
    ticPrice = regTicPrice * 0.9;

    if (location.charAt(0) == 'U'){
        ticPrice = ticPrice * 0.7;
    }
    else if (location.charAt(0) == 'L'){
        ticPrice = ticPrice * 1.25;
    }
    else if (location.charAt(0) == 'M'){
        ticPrice = ticPrice;
    }
}
else{
 ticPrice = 0;   
}

Answer 4

检查您编写的这行代码：

ticPrice = regTicPrice * 0.9;

    if (location.charAt(0) == 'U'){
        ticPrice = regTicPrice * 0.7;
    }

regTicPrice是50

ticPrice =  regTicPrice * 0.9

现在ticPrice的值= 50 * 0.9 = 45

下一行是

ticPrice = regTicPrice * 0.7
Wrong ==== ticPrice = 50 * 0.7 = 35
Right ==== ticPrice = 45 * 0.7 = 31.50

你压倒ticPrice：使用regTicPrice * 0.7

代码应该如下所示

ticPrice = regTicPrice * 0.9;

    if (location.charAt(0) == 'U'){
        ticPrice = ticPrice * 0.7;
    }

Answer 5

您必须使用float的{{1}}数据类型，如果您已经在使用它，请尝试ticPrice

Answer 6

重构并修复

ticPrice=(float)ticPrice * 0.9;

Answer 7

使用hashmap存储您的信息并从这里选择

Answer 8

if（cusType.charAt（0）=='A'）{ ticPrice = regTicPrice;

    if (location.charAt(0) == 'U'){
        ticPrice = ticPrice * 0.7;      //you made mistake here..
    }
    else if (location.charAt(0) == 'L'){
        ticPrice = ticPrice * 1.25;
    }
    else if (location.charAt(0) == 'M'){
        ticPrice = regTicPrice;
    }
}

else if (cusType.charAt(0) == 'S'){
    ticPrice = regTicPrice * 0.9;

    if (location.charAt(0) == 'U'){
        ticPrice = ticPrice * 0.7;
    }
    else if (location.charAt(0) == 'L'){
        ticPrice = ticPrice * 1.25;
    }
    else if (location.charAt(0) == 'M'){
        ticPrice = regTicPrice;
    }
}
else{
 ticPrice = 0;   
}

获得Cutsome类型（高级）后：50 * 0.9 = 45 = ticPrice。现在再次需要对loaction（Upper）应用折扣：45 * 0.7 = 31.5。=＆gt; ticPrice * 0.7。不是regTicPrice * 0.7

if语句及其编写顺序

8 个答案: