Why there is IF() output every time?

[nsashans]

#include <iostream>

int main(){
    char c;
    
    while(c!='x'){
        std::cout << "Enter c: ";
        std::cin >> c;
        if (c!='1' || c!='0')
            std::cout << "Error input\n";//???

    }
    return 0;
}

[Lowest0ne]

c either doesn't equal 1 or it doesn't equal 0. Sounds true to me.

Replace the or with and.

[nsashans]

Thanks!