Sri Lanka

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4. The Sovereignty of the People shall be exercised and enjoyed in the following manner :–
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(b) the executive power of the People, including the defence of Sri Lanka, shall be exercised by the President of the Republic elected by the People ;
… (Art. 4)

(1) There shall be a President of the Republic of Sri Lanka, who is the Head of the State, the Head of the Executive and of the Government and the Commander-in-Chief of the Armed Forces.
(2) The President of the Republic shall be elected by the People and shall hold office for a term of five years. (Art. 30)

(1) Any citizen who is qualified to be elected to the office of President may be nominated as a candidate for such office –
(a) by a recognized political party ; or
(b) if he is or has been an elected member of the legislature, by any other political party or by an elector whose name has been entered in any register of electors.
... (Art. 31)

Every person who is qualified to be an elector shall be qualified to be elected to the office of President unless he is subject to any of the following disqualifications–
(a) if he has not attained the age of thirty five years;
(b) if he is not qualified to be elected as a Member of Parliament under sub-paragraph (d), (e), (f) or (g) of paragraph (1) of Article 91; and
(c) if he has been twice elected to the office of President by the People.
(d) if he has been removed from the office of President under the provisions of sub-paragraph (e) of paragraph (2) of Article 38. (Art. 92)