foo.cc: In function 'int main()':
foo.cc:7:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
 gets(s1);gets(s2);
        ^
In file included from /usr/include/stdio.h:862:0,
                 from /usr/include/c++/7/cstdio:42,
                 from foo.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:232:1: note: declared here
 gets (char *__str)
 ^~~~
foo.cc:7:17: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
 gets(s1);gets(s2);
                 ^
In file included from /usr/include/stdio.h:862:0,
                 from /usr/include/c++/7/cstdio:42,
                 from foo.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:232:1: note: declared here
 gets (char *__str)
 ^~~~
foo.cc:8:37: warning: unused variable 'x' [-Wunused-variable]
 int i,j,l1=strlen(s1),l2=strlen(s2),x=0;
                                     ^
foo.cc:7:5: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
 gets(s1);gets(s2);
 ~~~~^~~~
foo.cc:7:14: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
 gets(s1);gets(s2);
          ~~~~^~~~
/tmp/ccnBW7Dr.o: In function `main':
foo.cc:(.text.startup+0x17): warning: the `gets' function is dangerous and should not be used.

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