For A: C language, the real type is stored in double and float, and the plastic type is stored in int. When the real type is stored in float, it is stored in the form of scientific counting. After a series of conversion and storage, some data will be lost when reading and calling (of course, the error is very small), so the result after participating in the operation is not accurate (refer to the relevant knowledge of float for details). For real type and shaping, it can only be said that the real type can represent a wide range of data, and it cannot be said that the calculation is more accurate.

For b: the array is allocated a continuous memory space. For a[5][5], the first data a[ 1][0] in the second row can be represented by a[5].

For c: the option is incomplete, but after executing a=b, a should be a symbolic variable. After the assignment statement is executed, the operation result on the right side of the equation will generally be forcibly converted to the type on the left side of the equation.

For D: The naming of text files and binary files is determined by how they are stored in storage space (hard disk, etc.). ), rather than relying on their own content.