Final answer:
The president who discovered that the White House needed repairs in 1945 was not mentioned in the provided information.
Step-by-step explanation:
The subject of this question is History. The question is asking about the president who discovered that the White House needed repairs in 1945. According to the information given, a leg from the president's daughter's piano crashed through the floor, and the wooden beams used after the fire of 1814 were not strong enough.
The addition of plumbing and electricity over the years had also weakened the floors.
The primary topic of this question is the history of the White House and the repairs it required. The SEO keywords for this answer are White House, repairs, and president.