Make a Calculator. Take 2 numbers (a & b) from the user .
1 : + (Addition) a + b
2 : - (Subtraction) a - b
3 : (Multiplication) a b
4 : / (Division) a / b
By through switch statement are as follows :
```java
import java.util.Scanner;
public class App {
public static void main(String[] args) t...
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