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C Brain Teasers: Exercise Your Mind

More Math, but Fun This Time

Explore logical problem solving through engaging math puzzles in C programming. Learn to analyze code snippets and predict outputs to deepen your understanding of C syntax and flow. This lesson helps enhance your coding logic and prepares you for practical programming challenges.

We'll cover the following...

Puzzle code

Read carefully the code given below:

C
#include <stdio.h>
double phi(double p, int precision)
{
  while(precision)
    return( p + 1/phi(p, precision-1) );
  return(p);
}
int main()
{
  double gr;
  gr = phi(1.0, 15);
  printf("Phi is %f\n", gr);
  
  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.
Phi is 1.6180345
B.
Phi is 1.618034
C.
Phi is 1.618033988749895
D.
Phi is 1.618033
1 / 1

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