Fixed - point notation is used if the exponent that would result from expressing the number in scientific notation is greater than - 5 and less than the precision specifier ; otherwise , scientific notation is used 如果用科學記數(shù)法表示數(shù)字時指數(shù)大于- 5而且小于精度說明符,則使用固定點表示法;否則使用科學記數(shù)法。