The Euclidean Algorithm is a way of finding the greatest common divisor d of two natural numbers n and m. Trace through the Euclidean Algorithm 5.14 for the following pairs of numbers: (a) m=9,n=12 (b) m=42,n=24
The Euclidean Algorithm is a way of finding the greatest common divisor d of two natural numbers n and m. Trace through the Euclidean Algorithm 5.14 for the following pairs of numbers: (a) m=9,n=12 (b) m=42,n=24
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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The Euclidean Algorithm is a way of finding the greatest common divisor d of two natural numbers n and m. Trace through the Euclidean Algorithm 5.14 for the following pairs of numbers:
(a) m=9,n=12
(b) m=42,n=24

Transcribed Image Text:**Algorithm 5.14 The Euclidean Algorithm**
**Preconditions:**
\( m, n \in \{0, 1, 2, 3, \ldots \} \)
**Postconditions:**
\( d \) is the greatest integer such that \( d \mid m \) and \( d \mid n \).
**Euclidean Algorithm Steps:**
1. **Initialize:**
- Set \( d \leftarrow m \)
- Set \( e \leftarrow n \)
2. **Loop until \( e \neq 0 \):**
- Compute \( r \leftarrow d \mod e \) (remainder of \( d \) divided by \( e \))
- Update \( d \leftarrow e \)
- Update \( e \leftarrow r \)
This algorithm effectively finds the greatest common divisor (GCD) of the given integers \( m \) and \( n \). The algorithm repeatedly replaces the larger number by its remainder when divided by the smaller number until the smaller number reaches zero. The last non-zero remainder is the GCD of the two original numbers.
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