/in/foo.c:2:1: warning: data definition has no type or storage class
 insert(int x,int n,int a[10000]);
 ^~~~~~
/in/foo.c:2:1: warning: type defaults to 'int' in declaration of 'insert' [-Wimplicit-int]
/in/foo.c:14:1: warning: return type defaults to 'int' [-Wimplicit-int]
 insert(int x,int n,int a[10000])
 ^~~~~~