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

[caipenghui]

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?

/ * binary bearch * /
#include <stdio.h>
int bsearch(int x, int a[], int n);
int main(void)
{
 Â Â  Â int a[] = {
 Â Â  Â Â Â  Â 0, 555,
 Â Â  Â Â Â  Â 3, 4, 5,
 Â Â  Â Â Â  Â 6,
 Â Â  Â };
 Â Â  Â printf("%d\n", bsearch(0, a, sizeof a / sizeof a[0]));
 Â Â  Â return 0;
}


int abaaaaasjkjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjerch(int x, int 
a[], int n)
{
 Â Â  Â int low;
 Â Â  Â int hig;
 Â Â  Â int mid;

 Â Â  Â low = 0;
 Â Â  Â hig = n - 1;
 Â Â  Â while (low <= hig) {
 Â Â  Â Â Â  Â mid = (low + hig) / 2;
 Â Â  Â Â Â  Â if (x < *(a + mid))
 Â Â  Â Â Â  Â Â Â  Â hig = mid - 1;
 Â Â  Â Â Â  Â else if (x > *(a + mid))
 Â Â  Â Â Â  Â Â Â  Â low = mid + 1;
 Â Â  Â Â Â  Â else
 Â Â  Â Â Â  Â Â Â  Â return mid;
 Â Â  Â }
 Â Â  Â return -1;
}