Question

i tried to write a program in C:

Here is a piece of code:

#include <stdio.h>
int i, left, right, largest = 0, n = 9;
int a[] = {23, 12, 22, 1, 4, 5, 16, 8, 9, 10};
int main()
{
 sort(a);
 //code to print sorted numbers here
 return 0;

}

void sort(int a[])
{
 buildheap(a);
 for(i = n; i < 0; i--)
 {
  exchange(i, 0);
  n = n - 1;
  maxheap(a, 0);
 }
}

It shows warnings like this:

heapsort.c:16: warning: conflicting types for âsortâ

Is this because i’m nto including conio.h ?

When i tried to include conio.h, the gcc compiler throws error that conio.h is not found.

Any link or explanation in detail about the above warning and its relevance/irrelevance to conio.h will be helpful

Update

Im sorry for missing basics here.

Thank you so much. My program is running fine now

Answer 1

It is because there is no declaration of sort() prior to its use. If a function is not declared (or defined) before it is used an implicit declaration is generated (the compiler should have emitted implicit declaration warnings) with signature int sort(). Either add a declaration or move the definition to before main().

Possibly same problem with buildheap(), exchange() and maxheap(): I don’t recognise any of these functions.