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Module DEMO-32-89DEMO-C-32

Natural Logarithm

DEMO-C-32 • Programming in C

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Problem Statement

Write a program that calculates the natural logarithm (base e) of a number using log.

Target difficulty: Easy

Constraints

x > 0

Input Format

A single positive floating-point number.

Output Format

The natural logarithm formatted to 2 decimal places.

Sample Testcases

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Sample #1
Public sample
Input
2.718
Output
1.00
Explanation
log(2.718) = 1.00
Sample #2
Public sample
Input
10.0
Output
2.30
Explanation
log(10.0) = 2.30
Sample #3
Public sample
Input
0.5
Output
-0.69
Explanation
log(0.5) = -0.69
Sample #4
Public sample
Input
5.0
Output
1.61
Explanation
log(5.0) = 1.61

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