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Character data and plastic data are common, but why do they only take up one byte in memory?
It is wrong to say that characters and integer data are common. It can only be said that 0-255 characters and integer data can be converted to each other, because this range just takes up one byte, and there is no loss in mutual conversion.

If it is greater than this value, it will take 2 bytes, and it cannot represent the character type, but only the integer type.