The ornamental design for an electroniccalculator, as shown and described.
FIG. 1 is a plan view of an electronic calculator showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof, the left side elevational
view being identical to a mirror image of the right side elevational view;
and