foo.cc: In function 'int main()':
foo.cc:7:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(q);
        ^
In file included from /usr/include/stdio.h:862:0,
                 from /usr/include/c++/7/cstdio:42,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:46,
                 from foo.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:232:1: note: declared here
 gets (char *__str)
 ^~~~
foo.cc:9:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<strlen(q);i++) {
          ~^~~~~~~~~~
foo.cc:7:6: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
  gets(q);
  ~~~~^~~
/tmp/ccaZUiV2.o: In function `main':
foo.cc:(.text.startup+0x35): warning: the `gets' function is dangerous and should not be used.

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