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C Brain Teasers: Exercise Your Mind

Discussion: What is Nothing?

Execute the code to understand the output and gain insights into floating-point arithmetic.

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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()
{
  float n, p;
  n = -0.0;
  p = +0.0;
  if( n==p )
    printf("negative zero is equal to positive zero\n");
  else
    printf("negative zero is not equal to positive zero\n");
  return(0);
}

Understanding the output

The code compares negative and positive zero as created by the compiler and stored in memory:

negative zero is equal to positive zero
Code ouput

Zero:

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