/in/foo.c: In function 'f':
/in/foo.c:7:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
         for(j=i,k=0;a[j]==b[k]&&k<strlen(b);j++,k++);
         ^~~
/in/foo.c:8:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   if(b[k]=='\0'){
   ^~
/in/foo.c: In function 'main':
/in/foo.c:21:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(s1);
  ^~~~
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.c:22:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(s2);
  ^~~~
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/ccSFYNBZ.o: In function `main':
foo.c:(.text.startup+0x12): warning: the `gets' function is dangerous and should not be used.