Consider the following C code segment: The output of the given C code segment is __________. (Answer in integer)

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Consider the following C code segment:   The output of the given C code segment is __________. (Answer in integer)

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This code implements the Euclidean algorithm to compute the greatest common divisor (GCD) of $ x = 126 $ and $ y = 105 $. The Euclidean algorithm works by repeatedly subtracting the smaller number from the larger number until the two numbers become equal, at which point the common value is the GCD. Step 1: Start with $ x = 126 $ and $ y = 105 $. Step 2: Subtract $ y = 105 $ from $ x = 126 $, resulting in $ x = 21 $ and $ y = 105 $. Step 3: Subtract $ x = 21 $ from $ y = 105 $, resulting in $ x = 21 $ and $ y = 84 $. Step 4: Subtract $ x = 21 $ from $ y = 84 $, resulting in $ x = 21 $ and $ y = 63 $. Step 5: Subtract $ x = 21 $ from $ y = 63 $, resulting in $ x = 21 $ and $ y = 42 $. Step 6: Subtract $ x = 21 $ from $ y = 42 $, resulting in $ x = 21 $ and $ y = 21 $. Step 7: Since $ x = y = 21 $, the loop terminates, and the GCD is $ 21 $. The final value, $ 21 $, is the greatest common divisor of $ 126 $ and $ 105 $, as determined by the Euclidean algorithm.

Consider the following C code segment:
The output of the given C code segment is __________. (Answer in integer)

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