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C Brain Teasers: Exercise Your Mind

Discussion: You See It Everywhere

Explore the Fibonacci sequence by running and analyzing C code that outputs its first 20 values. Learn how two variables and loop constructs work together to calculate the series, enhancing your grasp of algorithmic thinking and code execution in C.

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Run the code

Now, it's time to execute the code and observe the output.

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);
}

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