Question: Does the Saab 38 and the Saab JAS 39 Gripen have a single-engine or multiple engines?

Context paragraphs:
Saab 38: The Saab 38 (also known as B3LA or A 38/Sk 38) was a single-engine jet trainer and attack aircraft planned by Saab during the 1970s.  The project was a collaboration between Saab and the Italian aircraft manufacturer Aermacchi.  It was to replace the older Saab 105 jet trainer in the Swedish Air Force, but the aircraft never got past the drawing board and was canceled in 1979 in favour of the more advanced Saab JAS 39 Gripen fighter.

Direct voice input: Direct voice input (DVI) (sometimes called voice input control (VIC)) is a style of human–machine interaction "HMI" in which the user makes voice commands to issue instructions to the machine.  It has found some usage in the design of the cockpits of several modern military aircraft, particularly the Eurofighter Typhoon, the F-35 Lightning II, the Dassault Rafale and the JAS 39 Gripen, having been trialled on earlier fast jets such as the Harrier AV-8B and F-16 VISTA.  A study has also been undertaken by the Royal Netherlands Air Force using voice control in a F-16 simulator.

PS-05/A: The PS-05/A is a pulse-doppler radar currently used by the JAS 39 Gripen fighter aircraft (JAS 39A, B, C and D variants).  It weighs 156 kg and was developed by Ericsson in collaboration with GEC-Marconi, sharing some technology with the latter's Blue Vixen radar for the Sea Harrier (which inspired the Eurofighter's CAPTOR radar).

A-Darter: The V3E A-Darter (Agile Darter) is a modern short-range infrared homing ("heat seeking") air-to-air missile, featuring countermeasures resistance with a 180-degree look angle and 120-degrees per second track rate, developed by South Africa's Denel Dynamics (formerly Kentron) and Brazil's Mectron, Avibras and Opto Eletrônica.  It will equip South African Air Force's Saab JAS 39 Gripen C/D and BAe Hawk 120; Brazilian Air Force's A-1M AMX, Northrop F-5BR and Gripen E/F.  It is expected to be in production before the end of 2015.

Saab JAS 39 Gripen: The Saab JAS 39 Gripen (English: "griffin" ) is a light single-engine multirole fighter aircraft manufactured by the Swedish aerospace company Saab.  It was designed to replace the Saab 35 Draken and 37 Viggen in the Swedish Air Force ("Flygvapnet").  The Gripen has a delta wing and canard configuration with relaxed stability design and fly-by-wire flight controls.  It is powered by the Volvo RM12, and has a top speed of Mach 2.  Later aircraft are modified for NATO interoperability standards and to undertake in-flight refuelling.

Link-ZA: Link-ZA (also "Link ZA" or "LinkZA") is a tactical data link system used by the South African National Defence Force.  It is the data communication component of the "Combat Net Interoperability Standard" (CNIS).  Development began in the early 1990s when South Africa acquired a wide variety of high technology defence equipment such as Saab JAS 39 Gripen fighter jets, BAE Hawk lead-in fighter trainers, Valour-class frigates and other weapons systems.  Because South Africa was not able to acquire the NATO standard Link-16 system an indigenous system was developed.

Industrigruppen JAS: Industrigruppen JAS (IG JAS) was a Swedish industrial consortium under executive director Harald Schröder founded in August 1980 by Saab-Scania (later Saab), Volvo Flygmotor, LM Ericsson, Svenska Radioaktiebolaget Communications and Förenade Fabriksverken (FFV) for the development, construction and manufacturing of the new Swedish combat aircraft JAS 39 Gripen on behalf of the Swedish Airforce. The tender was submitted in June 1981 to Försvarets Materielverk (FMV), and on 30 June 1982 a contract was signed for development, and for five prototype aircraft and 30 production aircraft.

Bombkapsel 90: Bombkapsel 90 (BK90) is the Swedish Air Force's nomenclature for a gliding stand-off submunitions dispenser, or cluster bomb, with 72 submunitions.  It is manufactured by DaimlerChrysler Aerospace in Germany by the name of DWS 24 - "Dispenser Weapon System 24 barrels".  The BK90 is also commonly known as DWS 39 "Mjölner" because it was intended for use with the Saab JAS 39 Gripen.  In the future it could be also integrated on the Eurofighter Typhoon.  Its design is very similar to that of the American AGM-154 Joint Standoff Weapon.

Volvo RM12: The Volvo RM12 is a low-bypass afterburning turbofan jet engine developed for the Saab JAS 39 Gripen fighter.  A version of the General Electric F404, the RM12 was produced by Volvo Aero (now GKN Aerospace Engine Systems).

F 21 Luleå: F 21 Luleå, Norrbottens flygflottilj, "Norrbotten Air Force Wing", or simply "F 21", is a Swedish Air Force wing with the main base located in Luleå Airport in northern Sweden.  It is one of the three remaining wings in Sweden and currently has two squadrons of multirole aircraft.  F 21 in the north and F 17 in the south are the two wings remaining to have operational squadrons.  F 7 is a school where pilots begin their training in the JAS 39 Gripen.  After that the pilot's training is moved out to the two operational wings there they learn their final skills.

Supporting paragraphs: Saab 38 Saab JAS 39 Gripen
Answer: single-engine