What is wrong in this code

#1

#include
using namespace std;

int main(){
char ch;
int n1,n2;
cin >> ch ;

switch(ch){
	case '*':
	cout << n1 * n2 << endl;

	case '/':
	cout << n1/n2 << endl;

	case '+':
	cout << n1+n2 << endl;

	default :
	cout << "Invalid operation. Try again.";

	case 'x':
	case 'X':
	exit;
}

return 0;

}

#2

hi @abhishekraj93088 refer this,

#3

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