foo.cc: In function 'int main()':
foo.cc:8:12: error: invalid conversion from 'int' to 'char*' [-fpermissive]
    gets(s[N]);
         ~~~^
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 foo.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:232:1: note:   initializing argument 1 of 'char* gets(char*)'
 gets (char *__str)
 ^~~~
foo.cc:8:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    gets(s[N]);
             ^
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 foo.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:232:1: note: declared here
 gets (char *__str)
 ^~~~
foo.cc:9:8: error: 'strlen' was not declared in this scope
    sum=strlen(s);
        ^~~~~~
foo.cc:9:8: note: suggested alternative: 'mbrlen'
    sum=strlen(s);
        ^~~~~~
        mbrlen
foo.cc:12:10: error: invalid types 'int[int]' for array subscript
    if(a[i]>='a'&&a[i]<='z')
          ^
foo.cc:12:21: error: invalid types 'int[int]' for array subscript
    if(a[i]>='a'&&a[i]<='z')
                     ^
foo.cc:17:27: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
    printf("%.2f",x/sum*100);
                  ~~~~~~~~~^
foo.cc:8:8: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
    gets(s[N]);
    ~~~~^~~~~~

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