/in/foo.cc: In function 'int main()':
/in/foo.cc:35:5: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(k);sum=p=0;f=1;
     ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/c++/6/ext/string_conversions.h:43,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/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:35:11: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(k);sum=p=0;f=1;
           ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/c++/6/ext/string_conversions.h:43,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/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:36:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(p<strlen(k)-1);
           ~^~~~~~~~~~~~
/in/foo.cc:36:5: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
     while(p<strlen(k)-1);
     ^~~~~
/in/foo.cc:37:7: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while'
       {
       ^
/in/foo.cc:60:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    else if(k[p]=='+');
         ^~
/in/foo.cc:61:11: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
           fu=1;
           ^~
/in/foo.cc:47:5: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(sum>n)
     ^~
/tmp/cc6j5h0W.o: In function `main':
foo.cc:(.text.startup+0x6c): warning: the `gets' function is dangerous and should not be used.