/in/foo.cc: In function 'int main()':
/in/foo.cc:7:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
gets(a);
^
In file included from /usr/include/c++/7/cstdio:42:0,
from /usr/include/c++/7/ext/string_conversions.h:43,
from /usr/include/c++/7/bits/basic_string.h:6159,
from /usr/include/c++/7/string:52,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
extern char *gets (char *__s) __wur __attribute_deprecated__;
^~~~
/in/foo.cc:8:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
gets(b);
^
In file included from /usr/include/c++/7/cstdio:42:0,
from /usr/include/c++/7/ext/string_conversions.h:43,
from /usr/include/c++/7/bits/basic_string.h:6159,
from /usr/include/c++/7/string:52,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
extern char *gets (char *__s) __wur __attribute_deprecated__;
^~~~
/in/foo.cc:13:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=0;i<strlen(a);i++){
~^~~~~~~~~~
/tmp/ccoYCtJt.o: In function `main':
foo.cc:(.text.startup+0x22): warning: the `gets' function is dangerous and should not be used.