The gcc compiler detects functions in the C binary search program by default

[Andrew Pinski]

On Sat, Dec 28, 2019 at 6:31 PM caipenghui <caipenghui_c@163.com> wrote:
>
> hello everyone,
>
> I found that gcc version 9.2.1 20191008,
>
> i to compiles a binary search algorithm program that I write that only
> checks the function prototype,
>
> but does not check the name after the definition?
>

bsearch is a standard C function.
https://pubs.opengroup.org/onlinepubs/009695399/functions/bsearch.html
http://www.cplusplus.com/reference/cstdlib/bsearch/

Thanks,
Andrew Pinski

> / * binary bearch * /
> #include <stdio.h>
> int bsearch(int x, int a[], int n);
> int main(void)
> {
>      int a[] = {
>          0, 555,
>          3, 4, 5,
>          6,
>      };
>      printf("%d\n", bsearch(0, a, sizeof a / sizeof a[0]));
>      return 0;
> }
>
>
> int abaaaaasjkjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjerch(int x, int
> a[], int n)
> {
>      int low;
>      int hig;
>      int mid;
>
>      low = 0;
>      hig = n - 1;
>      while (low <= hig) {
>          mid = (low + hig) / 2;
>          if (x < *(a + mid))
>              hig = mid - 1;
>          else if (x > *(a + mid))
>              low = mid + 1;
>          else
>              return mid;
>      }
>      return -1;
> }
>
>