how to convert char to number datatypes and number to char

package datatypes;

public class SampleCodeChar {

   
    public static void main(String[] args) {
//         declare three variables cres,cvar1 and cvar2 as character
        //char  ivar1;
        //char  ivar2;
        //char  ires;

        char cvar1,cvar2,cres; //declaring multiple variables
                // in single declare statement
        //declare an integer
        int ires;
        // store 2147483646 in variable ivar1 and 2 in ivar2
        cvar1= 'A';
        cvar2= 'b';
        //cres= cvar1+cvar2; //this is an error
        cres= (char)(cvar1+cvar2); //Is it possible to add a to b
        ires= (short)cres;
        System.out.println("value of cres = "+cres);
        System.out.println("value of ires = "+ires);
        System.out.println("value of cvar1 = "+(short)cvar1);
        System.out.println("value of cvar2 = "+(short)cvar2);

    }

}


output:
value of cres = £
value of ires = 163
value of cvar1 = 65
value of cvar2 = 98