function mainfunction()

// ---------------------------------------
// --- Initialization of the operands. ---
// ---------------------------------------

v1 = %inf;
v2 = %nan;
v3 = %T;
v4 = %F;
v5 = %pi;

disp(-v1)
disp(v1+v2)
disp(v2)
disp(v3)
disp(v4)
disp(v5)

endfunction