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C Brain Teasers: Exercise Your Mind

You See It Everywhere

Explore this lesson to improve your ability to predict and understand the output of C code puzzles. You will develop logical reasoning skills essential for analyzing code behavior and prepare to discuss key concepts in the next lesson.

We'll cover the following...

Puzzle code

Read carefully the code given below:

C
#include <stdio.h>
int main()
{
  int f, n;
  int count;
  f = n = 1;
  count=0;
  while( count < 20 ) {
    printf("%d ", f);
    f+=n;
    printf("%d ", n);
    n+=f;
    count+=2;
  }
  putchar('\n');
  return(0);
}

Your task: Guess the output

Attempt the following test to assess your understanding.

Technical Quiz
1.

What is the expected output of the above code?

A.
1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765 10946
B.
1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765
C.
1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765 10946 17711
D.
1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765 10946 17711
1 / 1

Let's discuss the code and output together in the next lesson.