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DSP28377D float型数据赋值精度问题



在DSP28377D中对两个float型变量进行赋值,连上仿真器后运行查看变量的值和赋的初值有差异,如下图上面为赋值,下面为CCS中查看的变量值,一个是小数点第11位有差异,一个是第8位有差异,这个是啥原因?另外float型的精度是到小数点后几位?