Question

Im a little puzzled about this behaviour. Can Anyone Explain

  void Decrement(int* x){
        *x--; //using this line, the output is 5 

        //*x=*x-1; //using this l ine, the output is 4

    }

    int main(){
        int myInt=5;
        Decrement(&myInt);
        cout<<myInt<<endl;
        return 0;
    }

    Output: 5

Answer 1

*x-- means *(x--). That is, your program modifies x, not what it points to. Since it’s passed by value, that modification has no effect in main(). To match your commented line, you’d need to use (*x)--.