/** WAP using switch case to print the following :
1. 3X+4Y+Z 
2. 3A^2+4B^3+3C*/
import java.util.*;
class F
{
public static void main(String a[])
{
Scanner in = new Scanner(System.in);
System.out.println("Algebra Program executed :                     No. to be typed: ");
System.out.println(" (i) 3X+4Y+Z                                                 1 ");
System.out.println(" (ii) 3A^2+4B^3+3C                                           2 ");
int ch = in.nextInt();
switch(ch)
{
//Program 1
case '1': Scanner sc = new Scanner(System.in);
System.out.println("Type a number for X...");
int X = sc.nextInt();
System.out.println("Type a number for Y...");
int Y = sc.nextInt();
System.out.println("Type a number for Z...");
int Z = sc.nextInt();
int sum = (3*X)+(4*Y)+Z;
System.out.println(" ");
System.out.println("Value of X is "+X);
System.out.println("Value of Y is "+Y);
System.out.println("Value of Z is "+Z);
System.out.println("Value of 3X+4Y+Z is "+sum);
break;
//Program 2
case '2': Scanner hi = new Scanner(System.in);
System.out.println("Type a number for A...");
double A = hi.nextDouble();
System.out.println("Type a number for B...");
double B = hi.nextDouble();
System.out.println("Type a number for C...");
double C = hi.nextDouble();
double pro = 3*Math.pow(A, 2) + 4*Math.pow(B, 3) + 3*C;
int isum = (int) pro;
System.out.println(" ");
System.out.println("Value of A is "+A);
System.out.println("Value of B is "+B);
System.out.println("Value of C is "+C);
System.out.println("Value of 3A^2+4B^3+3C is "+isum);
break;
//Else
default: System.out.println("Wrong Choice");
}
}
}```
</details>
# 答案1
**得分**: 4
你需要将情况更改为 `case 1` 和 `case 2`，而不是 `case &#39;1&#39;` 和 `case &#39;2&#39;`。
请注意，`&#39;1&#39;` 和 `&#39;2&#39;` 是 `char` 字面值；不是 `int` 字面值。`&#39;1&#39;` 的 ASCII 值是 `49`，`&#39;2&#39;` 的 ASCII 值是 `50`。
<details>
<summary>英文:</summary>
You need to change the case to `case 1` and `case 2` instead of  `case &#39;1&#39;` and `case &#39;2&#39;`. 
Note that `&#39;1&#39;` and `&#39;2&#39;` are `char` literals; not the `int` literals. the ASCII value of `&#39;1&#39;` is `49` and that of `&#39;2&#39;` is `50`.
</details>