Singapore

(1) There shall be a President of Singapore who shall be the Head of State.
… (Art. 17)

(1) The President is to be elected by the citizens of Singapore in accordance with any law made by the Legislature.
… (Art. 17 A)

(1) No person shall be elected as President unless he is qualified for election in accordance with the provisions of this Constitution.
(2) A person shall be qualified to be elected as President if he —
(a) is a citizen of Singapore;
(b) is not less than 45 years of age;
(c) possesses the qualifications specified in Article 44 (2) (c) and (d);
(d) is not subject to any of the disqualifications specified in Article 45;
(e) satisfies the Presidential Elections Committee that he is a person of integrity, good character and reputation;
(f) is not a member of any political party on the date of his nomination for election; and
(g) satisfies the Presidential Elections Committee that —
(i) he has, at the date of the writ of election, met either the public sector service requirement in clause (3) or the private sector service requirement in clause (4); and
(ii) the period of service counted for the purposes of clause (3)(a), (b) or (c)(i) or (4)(a)(i) or (b)(i) or each of the 2 periods of service counted for the purposes of clause (3)(d) or (4)(c), as the case may be, falls partly or wholly within the 20 years immediately before the date of the writ of election.
… (Art. 19)

(1) The executive authority of Singapore shall be vested in the President and exercisable subject to the provisions of this Constitution by him or by the Cabinet or any Minister authorised by the Cabinet.
… (Art. 23)