The line of code that displays the floating point number stored in the variable x using 3 decimal places is:

Question

BlackTom AI · Accepted Answer

Question restatement: The line of code that displays the floating point number stored in the variable x using 3 decimal places is:

Answer options:
- print("%.3f", x)
- print("%3.f", x)
- print("%.3f" % x)
- print("%3.f" % x)

Option 1: print("%.3f", x)
This does not apply the formatting specifier to x. In Python, using a comma in print separates arguments and prints them with a space between them, so the formatting directive "%.3f" is treated as a plain string argument, not as a formatting operation. Therefore, the output will be the string "%.3f" followed by a space and then the value of x printed in its default representation, which is not three decimal places.

Option 2: print("%3.f", x)
Similar to option 1, the format string is not applied to x because the print statement passes two arguments. The result is the literal string "%3.f" followed by a space and then x’s default representation. The formatting specifier here is ignored.

Option 3: print("%.3f" % x)
This is the correct usage of Python’s old-style string formatting. The expression "% .3f" % x applies the format: it converts x to a floating-point number with exactly three digits after the decimal point, and then prints that single formatted string. This achieves displaying x with three decimal places, as required.

Option 4: print("%3.f" % x)
This uses the format specifier "%3.f" with the percent operator, which would format x with zero digits after the decimal point (since there is no .<precision> specified, only width). Consequently, the output would be x rounded to an integer-like value within a width of 3 characters, not three decimal places. This does not meet the requirement of three decimal places.

Summary: Only option 3 actually applies the formatting to x to show three decimals, while options 1, 2, and 4 either ignore the formatting directive due to argument separation or produce a different precision than three decimals.

The line of code that displays the floating point number stored in the variable x using 3 decimal places is:单项选择题

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