The difference between whatabeautifulday and howabeautifulday

The difference between "Whatabeautifulday" and "Howabeautifulday" is that the former is a question, which means "it's a beautiful day today" and is used to express surprise or praise for the weather or life. The latter is a declarative sentence, which means "how beautiful it is today" and is used to describe the weather or life of that day.

It should be noted that in English, interrogative sentences generally end with a question mark and declarative sentences end with a period. So what a beautiful day should be written as what a beautiful day? And "Howabeautifulday" should be written as "Howabeautifulday"