问题描述
我是 Javascript 的完全初学者，并尝试使用尽可能简单的代码。在 if 语句中使用提示中的变量时，在区分大小写方面存在一些问题。这是有问题的代码。假设输入完全是“法语”，它可以完美运行
if (number => 1 && number <= 30) {
var lang= prompt ("Which language do you want to translate into,french or German?");
}
while(lang != "french" && lang != "french" && lang != "french" && lang != "German" && lang != "german" && lang != "GERMAN" ) {
alert("Only french or German is allowed");
var lang= prompt ("Which language do you want to translate into,french or German?");
}
if (number == 1 && lang == "french") {
alert("The translation is " +frenchNumbers[1]);
}
if (number == 2 && lang == "french") {
alert("The translation is " +frenchNumbers[2]);
}
if (number == 3 && lang == "french") {
alert("The translation is " +frenchNumbers[3]);
}
如果用户要输入 'french' 或 'french'，我希望 'if' 语句也能工作。我尝试使用下一段代码，但它从一开始就循环显示警报，这不是我想要的。例如，如果我要输入“3”和“french”，我将首先收到“1”和“2”的警报。
if (number == 1 && lang == "french" || lang == "french" || lang == "french") {
alert("The translation is " +frenchNumbers[1]);
}
if (number == 2 && lang == "french" || lang == "french" || lang == "french") {
alert("The translation is " +frenchNumbers[2]);
}
if (number == 3 && lang == "french" || lang == "french" || lang == "french") {
alert("The translation is " +frenchNumbers[3]);
}
我相信有一个简单的解决方法，尝试解决它有点疯狂，因为我查看的所有信息都远高于我的技能水平
任何帮助都会很棒
谢谢，布拉德
解决方法
正如 Chris Baker 所述，您可以使用 public class Product extends ConsoleProgram{
public void run(){
int intValue = 5;
double doubleValue = 2.5;
int product1 = product(intValue,intValue);
System.out.println(product1);
// Use method overloading to define methods
// for each of the following method calls
double product2 = product(doubleValue,doubleValue);
System.out.println(product2);
int product3 = product(intValue,intValue,intValue);
System.out.println(product3);
double product4 = product(intValue,doubleValue);
System.out.println(product4);
double product5 = product(doubleValue,intValue);
System.out.println(product5);
double product6 = product(doubleValue,doubleValue,doubleValue);
System.out.println(product6);
}
public int product(int one,int two){
return (int)(one * two);
}
public double product(double one,double two){
return (double)(one * two);
}
public double product(int one,double two){
return (double)(one * two);
}
public int product(int one,int two,int three){
return (int)(one * two * three);
}
public double product(double one,double two,double three){
return (double)(one * two * three);
}
public double product(double one,int two){
return (double)(one * two);
}
}
。需要调整的代码如下。
.toLowerCase()