45. The President shall hold office for a term of five years from the date on which he enters upon his office:
Provided that-
(a) The President may, by resignation under his hand addressed to the Chairman of the Council of States and the Speaker of the House of the People, resign his office;
(b) The President may, for violation of the Constitution, be removed from office by impeachment in the manner provided in article 50 of this Constitution:
(c) The President shall, notwithstanding the expiration of his term, continue to hold office until his successor enters upon his office.