Instead of #defineing size to be 10, you should declare a static const.

 static const size = 10;

This answer explains nicely as to why. Good job on having this declared though, it's better than having magic numbers in your code.

You should never declare main() to return void. There is no good reason to not declare it as int main(). See this answer for more explanation.

You should declare your main with void parameters, as such:

 int main(void) 

Your main() is doing too much within it. You should abstract your code into different functions and then call it from within main().

Put the variable declarations to separate lines and initialize them to some value. From Code Complete, 2d Edition, p. 759:

You should declare your for loops as such:

 for(int i=0; i < size; ++i)

Note that this was introduced in the C99 standard. There is no reason you should not be using this standard in your code.

Why do you limit yourself to finding palindromes within an int array? It's more typical to find palindromes within a string.

Right now the time complexity for your algorithm is \$ O(n^3) \$, which is expensive. Let's use Manacher's algorithm which can do it in \$ O(n) \$. Here is a C implementation of the algorithm, but recognize that this has some bad practices within the code and should only be looked at to get an idea for implementing the algorithm yourself.

Instead of #defineing size to be 10, you should declare a static const.

 static const size = 10;

This answer explains nicely as to why. Good job on having this declared though, it's better than having magic numbers in your code.

You should never declare main() to return void. There is no good reason to not declare it as int main(). See this answer for more explanation.

You should declare your main with void parameters, as such:

 int main(void) 

Your main() is doing too much within it. You should abstract your code into different functions and then call it from within main().

Put the variable declarations to separate lines and initialize them to some value. From Code Complete, 2d Edition, p. 759:

You should declare your for loops as such:

 for(int i=0; i < size; ++i)

Note that this was introduced in the C99 standard. There is no reason you should not be using this standard in your code.

Why do you limit yourself to finding palindromes within an int array? It's more typical to find palindromes within a string.

Right now the time complexity for your algorithm is \$ O(n^3) \$, which is expensive. Let's use Manacher's algorithm which can do it in \$ O(n) \$. Here is a C implementation of the algorithm, but recognize that this has some bad practices within the code and should only be looked at to get an idea for implementing the algorithm yourself.

Instead of #defineing size to be 10, you should declare a static const.

 static const size = 10;

This answer explains nicely as to why. Good job on having this declared though, it's better than having magic numbers in your code.

You should never declare main() to return void. There is no good reason to not declare it as int main(). See this answer for more explanation.

Your main() is doing too much within it. You should abstract your code into different functions and then call it from within main().

Put the variable declarations to separate lines and initialize them to some value. From Code Complete, 2d Edition, p. 759:

Every variable should be initialized when it is declared.

You should declare your for loops as such:

 for(int i=0; i < size; ++i)

Note that this was introduced in the C99 standard. There is no reason you should not be using this standard in your code.

Why do you limit yourself to finding palindromes within an int array? It's more typical to find palindromes within a string.

Right now the time complexity for your algorithm is \$ O(n^3) \$, which is expensive. Let's use Manacher's algorithm which can do it in \$ O(n) \$. Here is a C implementation of the algorithm, but recognize that this has some bad practices within the code and should only be looked at to get an idea for implementing the algorithm yourself.

Instead of #defineing size to be 10, you should declare a static const.

 static const size = 10;

This answer explains nicely as to why. Good job on having this declared though, it's better than having magic numbers in your code.

You should never declare main() to return void. There is no good reason to not declare it as int main(). See this answer for more explanation.

You should declare your main with void parameters, as such:

 int main(void) 

Your main() is doing too much within it. You should abstract your code into different functions and then call it from within main().

Put the variable declarations to separate lines and initialize them to some value. From Code Complete, 2d Edition, p. 759:

You should declare your for loops as such:

 for(int i=0; i < size; ++i)

Note that this was introduced in the C99 standard. There is no reason you should not be using this standard in your code.

Why do you limit yourself to finding palindromes within an int array? It's more typical to find palindromes within a string.

Right now the time complexity for your algorithm is \$ O(n^3) \$, which is expensive. Let's use Manacher's algorithm which can do it in \$ O(n) \$. Here is a C implementation of the algorithm, but recognize that this has some bad practices within the code and should only be looked at to get an idea for implementing the algorithm yourself.