/in/foo.c: In function 'main':
/in/foo.c:13:2: warning: implicit declaration of function 'Insert' [-Wimplicit-function-declaration]
  Insert(x,a,n);
  ^~~~~~
/in/foo.c: In function 'Insert':
/in/foo.c:29:2: error: 'else' without a previous 'if'
  else break;
  ^~~~
/in/foo.c:29:7: error: break statement not within loop or switch
  else break;
       ^~~~~
/in/foo.c: At top level:
/in/foo.c:31:1: error: expected identifier or '(' before 'return'
 return 0;
 ^~~~~~
/in/foo.c:32:1: error: expected identifier or '(' before '}' token
 }
 ^
/in/foo.c: In function 'Insert':
/in/foo.c:30:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^