/in/foo.c: In function 'My_':
/in/foo.c:11:6: warning: statement with no effect [-Wunused-value]
  b[j]!='\0';
  ~~~~^~~~~~
/in/foo.c: In function 'main':
/in/foo.c:16:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&x1);
          ^