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Question 244

Circle Circumference from Input

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Circle Circumference from Input

Read a circle's radius (a decimal number) from standard input and print its circumference rounded to two decimal places. Use the formula circumference = 2 * 3.14159 * r with the value 3.14159 for PI. For example, if the input is 3, print:

18.85

Use printf with %.2f and no trailing newline.

Expected Output:

18.85
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📥 Auto-Input:
3\n
This input is automatically fed to your program's stdin
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