Question

好吧，我对整体产品有问题，我是新手，所以我无法发现我出错的地方。我输入我的转换类型ex：1（英寸 - 厘米）说我想知道多少厘米5英寸，它会导致说：12.7厘米= 55.0？对我来说有意义，为什么它这样做，任何帮助都会很棒！

switch(Integer.parseInt(jTextField1.getText())){  
case 1:
InchesToCm();
break;
case 2:
CmToFeet();
break;
case 3:
MetresToYards();
break;
case 4:
KmToMetres();
break;
default:
jLabel8.setText("Error, try again");
break;

}








}                                        


private void InchesToCm() {
 double inches, centimetres;   //identify variables
String messageOut;

inches = Double.parseDouble(jTextField2.getText());          //get the text
centimetres = (inches*2.54);                                 //preform   
messageOut = centimetres + "cm = " + Math.round(inches) + inches;    //msg
jLabel8.setText(messageOut);
 } 
private void CmToFeet() {
double feet, centimetres;
String messageOut;

feet = Double.parseDouble(jTextField2.getText());
centimetres = (feet*30);
messageOut = centimetres + "cm = " + Math.round(feet) + feet;
jLabel8.setText(messageOut);

}
private void MetresToYards() {
double metres, yards;
String messageOut;

yards = Double.parseDouble(jTextField2.getText());
metres = (yards*0.91);
messageOut = metres + "m = " + Math.round(yards) + yards;
jLabel8.setText(messageOut);
}
private void KmToMetres() {
double miles, kilometres;
String messageOut;

miles = Double.parseDouble(jTextField2.getText());
kilometres = (miles*1.6);
messageOut = kilometres + "km = " + Math.round(miles) + miles;
jLabel8.setText(messageOut);
}

Answer 1

您要连续两次打印lemma "(χ x y. (x, y)) $ 1 $ 2 = (1,2)" by simp term "(χ x y z. (x, y + z))" (* "χ x y z. (x, y + z)" :: "'a ^ 3 ⇒ 'a × 'a" *)变量并让自己感到困惑。 inches返回值负责Math.round，5本身（inches）的打印负责double。连接后，它显示为5.0。我怀疑你想要打印 string 55.0：

"inches"

应该对其他方法进行类似的更改。

转换计算器，结果问题..随机答案不正确？

1 个答案: