运行 ID: 23151

Main.cc: In function ‘int main()’:
Main.cc:8:11: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations]
     gets(a);
           ^
In file included from /usr/include/stdio.h:862:0,
                 from /usr/include/c++/7/cstdio:42,
                 from /usr/include/c++/7/ext/string_conversions.h:43,
                 from /usr/include/c++/7/bits/basic_string.h:6361,
                 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 Main.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:232:1: note: declared here
 gets (char *__str)
 ^~~~
Main.cc:9:9: error: ‘strlen’ was not declared in this scope
     len=strlen(a);
         ^~~~~~
Main.cc:9:9: note: suggested alternative: ‘mbrlen’
     len=strlen(a);
         ^~~~~~
         mbrlen
Main.cc:8:9: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result]
     gets(a);
     ~~~~^~~