#include <stdio.h>
int main() 
{
int sort(int);
int a[11] = {1, 4, 6, 8, 0, 9, 7, 5, 2, 3};
sort(a);
}
int sort(int *a) 
{
int i,j, k, temp;
for (j = 2; j < 10; j++) 
{
for (k = 0; k < j; k++) 
{
if (a[j] < a[k]) 
{
temp = a[k];
a[k] = a[j];
a[j] = temp;
}
}
}
for (i = 0; i < 10; i++) 
{
printf ("%d ", a[i]);
}
}

On compilation:
qwerty@qwerty-workstation:~$ cc Insertion.c
Insertion.c: In function ‘main’:
Insertion.c:6: warning: passing argument 1 of ‘sort’ makes integer from pointer without a cast
Insertion.c: At top level:
Insertion.c:9: error: conflicting types for ‘sort’
Insertion.c:4: error: previous declaration of ‘sort’ was here