A variable I is a string variable, and "5" belongs to a string, so A is correct. Because the contents in quotation marks represent a string

BK is an integer variable. This code is to divide the value of k by 2. If the division is a decimal, carry out the carry operation. Similar to rounding, but here, no matter what, you will enter, and there is no shed.

CK is an integer variable. Correct answer. According to common sense, the value of k is multiplied by 2.5 after a square operation, and if it is a decimal, it is carried out with a carry operation. But it is always a numerical value, so it conforms to the variable type. But this is easy to cause ambiguity. I don't know whether to square k by multiplying it by 2.5 first, or to square it first and then multiply it by 2.5. So the meaning of C is not clear.

D assigns a value to i .. The str () function is used here to convert a numerical value into a string. So it conforms to the type of variable I.