Why this error?

#1

ERROR:
runguard: warning: timelimit exceeded (wall time): aborting command runguard: warning: command terminated with signal 15

CODE :
#include<bits/stdc++.h>
using namespace std;
int main() {
char ch[10];
cin>>ch;

while(ch != "X" ||  ch !="x"){
	int a,b;
	cin>>a>>b;
    if(ch=="+"){
        cout<<a+b<<"\n";
    }
    else if(ch=="-"){
        cout<<a-b<<"\n";
    }
    else if(ch=="*"){
        cout<<a*b<<"\n";
    }
    else if(ch=="/"){
        cout<<a/b<<"\n";
    }
    else if(ch=="%"){
        cout<<a%b<<"\n";
    }
    else{
        cout<<"Invalid operation. Try again."<<"\n";
    }
    cin>>ch;
    
}
return 0;

}

#2

hi @alien this is segmentation fault error.
Your code is going into an infinite loop. The while loop condition should be

while (ch != 'X' && ch != 'x')
#3

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