Error in the program

#1

I wrote this program for a calculator:-
import java.util.Scanner;
public class Main {
public static void main(String args[]) {
Scanner scn = new Scanner(System.in);
char ch;
do{
ch = scn.next().charAt(0);
int n1 = scn.nextInt();
int n2 = scn.nextInt();
int a;
if(ch==’+’){
a=n1+n2;
System.out.println(a);
}else if(ch==’-’){
a=n1-n2;
System.out.println(a);
}else if(ch==’’){
a=n1n2;
System.out.println(a);
}else if(ch==’/’){
a=n1/n2;
System.out.println(a);
}else if(ch==’%’){
a=n1%n2;
System.out.println(a);
}else{
System.out.println(“Invalid Operation.Try again”);
}
}while(ch!=‘x’||ch!=‘X’);
}
}

And I got this error:-
Exception in thread “main” java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:864)
at java.util.Scanner.next(Scanner.java:1485)
at java.util.Scanner.nextInt(Scanner.java:2117)
at java.util.Scanner.nextInt(Scanner.java:2076)
at Main.main(Main.java:8)

#2

see, these two lines
int n1 = scn.nextInt();
int n2 = scn.nextInt();
will work only when ch is one of arithmetic operator.
in your code even if ch is x, these two lines are executed and scanner didn’t get integers and throws exception.

Thanks.

#3

please resolve it and rate it if satisfied.
Thanks

#4

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