#include<iostream> using namespace std; int main(){ char a[100]; gets(a); for(int i=strlen(a)-1;i>=0;--i) cout<<a[i]; return 0; } /* Main.cc: In function 'int main()': Main.cc:7:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations] gets(a); ^ In file included from /usr/include/c++/8/cstdio:42, from /usr/include/c++/8/ext/string_conversions.h:43, from /usr/include/c++/8/bits/basic_string.h:6400, from /usr/include/c++/8/string:52, from /usr/include/c++/8/bits/locale_classes.h:40, from /usr/include/c++/8/bits/ios_base.h:41, from /usr/include/c++/8/ios:42, from /usr/include/c++/8/ostream:38, from /usr/include/c++/8/iostream:39, from Main.cc:1: /usr/include/stdio.h:583:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ Main.cc:7:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations] gets(a); ^ In file included from /usr/include/c++/8/cstdio:42, from /usr/include/c++/8/ext/string_conversions.h:43, from /usr/include/c++/8/bits/basic_string.h:6400, from /usr/include/c++/8/string:52, from /usr/include/c++/8/bits/locale_classes.h:40, from /usr/include/c++/8/bits/ios_base.h:41, from /usr/include/c++/8/ios:42, from /usr/include/c++/8/ostream:38, from /usr/include/c++/8/iostream:39, from Main.cc:1: /usr/include/stdio.h:583:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ Main.cc:8:12: error: 'strlen' was not declared in this scope for(int i=strlen(a)-1;i>=0;--i) ^~~~~~ Main.cc:8:12: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'? Main.cc:2:1: +#include <cstring> Main.cc:8:12: for(int i=strlen(a)-1;i>=0;--i) ^~~~~~ */ |
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