gain=33.25;

sprintf(&data[9],"%5.2",gain);

上面函數(shù)的用法就是把傳進(jìn)來(lái)的gain變量,變換成五個(gè)數(shù),但里面包含兩位小數(shù).

比如:033.25這樣的float數(shù)據(jù).

然后把033.25這樣的數(shù)據(jù)變成ascii傳入到data數(shù)組里面.

?float形式的033.25轉(zhuǎn)換成字符形式的033.25就會(huì)是:0x30 0x33 0x33 0x2e 0x32 0x35.

即把每一位都轉(zhuǎn)換成字符.

這里面0x2e代表小數(shù)點(diǎn).