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F28069浮点问题

Other Parts Discussed in Thread: CONTROLSUITE

F28069是支持浮点的,是不是必须按下面这样开启才行

现有个疑问,在开启和不开启上面功能时,分别执行下面语句,有什么区别吗?

float y = 0;
float m = 0.5;
float x = 3.3;
float b = 4.2;

y = m*x+b;