2:02 >perl -wE "my $dec = 0.99982928833; my $sci = sprintf qq[%11e], $dec; say $sci;"
9.998293e-001

 2:03 >perl -wE "my $dec = 0.99982928833; my $sci = sprintf qq[%.11e], $dec; say $sci;"
9.99829288330e-001

 2:03 >perl -v

This is perl 5, version 20, subversion 2 (v5.20.2) built for MSWin32-x64-multi-thread