Question

to assign a double variable d to a float variable x, you write ______.
a x = d;

b x = (int)d;

c x = (long)d

d x = (float)d;

Explanation:

To assign a double variable d to a float variable x, we need to perform a type - casting from double to float. In Java (or similar programming languages), when we want to convert a value of one type to another, we use type - casting. The syntax for casting a double value d to a float is (float)d.

• Option A: Just writing x = d; will not work in languages where strict type - checking is done for narrowing conversions (from double to float is a narrowing conversion as double has a larger range than float). The compiler will raise an error.
• Option B: (int)d casts d to an int, which is not what we want. We need a float type, not an int type.
• Option C: (long)d casts d to a long, which is also not the desired type (we need float).
• Option D: x=(float)d; correctly casts the double variable d to a float and then assigns it to the float variable x.

Answer:

D. \( x = (\text{float})d; \)