foo.cc: In function 'int main()':
foo.cc:11:17: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   11 |     gets(text[i]); //这是啥情况。
      |                 ^
In file included from /usr/include/stdio.h:867,
                 from /usr/include/c++/9/cstdio:42,
                 from /usr/include/c++/9/ext/string_conversions.h:43,
                 from /usr/include/c++/9/bits/basic_string.h:6496,
                 from /usr/include/c++/9/string:55,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from foo.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:235:1: note: declared here
  235 | gets (char *__str)
      | ^~~~
foo.cc:11:17: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   11 |     gets(text[i]); //这是啥情况。
      |                 ^
In file included from /usr/include/stdio.h:867,
                 from /usr/include/c++/9/cstdio:42,
                 from /usr/include/c++/9/ext/string_conversions.h:43,
                 from /usr/include/c++/9/bits/basic_string.h:6496,
                 from /usr/include/c++/9/string:55,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from foo.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:235:1: note: declared here
  235 | gets (char *__str)
      | ^~~~
foo.cc:26:25: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   26 |       else if(text[i][j]=' ')
      |               ~~~~~~~~~~^~~~
foo.cc:36:19: error: expected ';' before 'cout'
   36 |  cout<<upper<<endl
      |                   ^
      |                   ;
   37 |  cout<<lower<<endl
      |  ~~~~              
foo.cc:11:9: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
   11 |     gets(text[i]); //这是啥情况。
      |     ~~~~^~~~~~~~~

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