GATE CS 2025 Set 2 — Question 33
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Programming & Data Structures → C Programming → Control Flow
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Question
int x=126, y=105;
do {
if(x>y) x=x-y;
else y=y-x;
} while(x!=y);
printf("%d",x);
The output of the given C code segment is ________. (Answer in integer)
Correct answer
21 to 21
Solution
The given C code implements the Euclidean algorithm for finding the Greatest Common Divisor (GCD) of two numbers using subtraction.Initial values: , .Iteration 1:
() is true.
.
Values: , .
Condition () is true.Iteration 2:
() is false.
.
Values: , .
Condition () is true.Iteration 3:
() is false.
.
Values: , .
Condition () is true.Iteration 4:
() is false.
.
Values: , .
Condition () is true.Iteration 5:
() is false.
.
Values: , .
Condition () is false. The loop terminates.The
() is true.
.
Values: , .
Condition () is true.Iteration 2:
() is false.
.
Values: , .
Condition () is true.Iteration 3:
() is false.
.
Values: , .
Condition () is true.Iteration 4:
() is false.
.
Values: , .
Condition () is true.Iteration 5:
() is false.
.
Values: , .
Condition () is false. The loop terminates.The
printf statement prints the value of , which is 21.Continue learning with Success Tracker
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