What is the problem with this? code why it is not running?

#1 
int n1,n2,c;
char ch;
cin >>ch;
while(ch!='X'||ch!='x'){
 if(ch=='+'){
		cin>>n1>>n2;
		c=n1+n2;
		cout<<c<<endl;
	}
	else if(ch=='-'){
		cin>>n1>>n2;
		c=n1-n2;
		cout<<c<<endl;

	}
	else if(ch=='*'){
		cin>>n1>>n2;
		c=n1*n2;
		cout<<c<<endl;
	}
	else if(ch=='/'){
		cin>>n1>>n2;
		c=n1/n2;
		cout<<c<<endl;
	}
	else if(ch=='%'){
		cin>>n1>>n2;
		c=n1%n2;
		cout<<c<<endl;
	}
	else{
		cout<<"invalid operation"<<endl;
	}
	cin>>ch;
}
return 0;

}

#2

The condition in the while loop should be (ch != 'X' && ch != 'x') .

#3

You can refer my code as well

#4

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