I have interfaced a matrix keypad

Question

Every time I am entering in a case loop the last value gets reset by the key I press. But I want the last value I have updated whenever I enter in any case loop.

void menu()
{
    menu_no=key_pressed;
    
    switch (key_pressed)
    {
        case 1:
        {
            ID_set = menu_no;
            sprintf(menu_print,"Id%3d",ID_set); break;
        }
        case 2:
        {
            digit_set = menu_no;
            sprintf(menu_print,"dig%2d",digit_set); break;
        }
        case 3:
        {
            base_type_set = menu_no;
            sprintf(menu_print,"bt%3d",base_type_set); break;
        }
        case 4:
        {
            voice_set = menu_no;
            sprintf(menu_print,"v%4d",voice_set); break;
        }
        default: break;
    }
}