Gate 2025 | Question on GCD | Question on Do While Loop | What is the output?

For full video explanation:    • 123| GATE CSE 2025| Question on Do Wh...  
What is the output of the following code:
int main() {
int x=126,y=105;
do{
if(x greater than y)
x=x-y;
else
y=y-x;
}while(x!=y);
printf("%d",x);

return 0;
}


Welcome to another GATE CSE 2025 problem-solving session! 🚀 In this video, we analyze a C programming question on the Do-While loop, where we compute the GCD (Greatest Common Divisor) of two numbers using the given code snippet. Loops and number theory-based logic are frequently tested in the GATE Computer Science exam, making this an essential concept to master.

🔹 What You’ll Learn in This Video?
✅ How the Do-While loop works in C
✅ Understanding step-by-step execution of the Euclidean algorithm
✅ Dry run of the given code snippet and deriving the output
✅ Common mistakes and important takeaways for GATE

🔹 Why Watch This?
📌 Important concept for GATE CSE 2025 exam
📌 Strengthen your C programming, loops, and algorithmic thinking
📌 Perfect for GATE aspirants & coding enthusiasts

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