Run id: 7500

Main.cc: In function 'int main()':
Main.cc:13:21: error: invalid conversion from 'char*' to 'int' [-fpermissive]
         if(isdigit(a)){
                     ^
In file included from /usr/include/c++/4.8.2/cctype:42:0,
                 from /usr/include/c++/4.8.2/bits/localefwd.h:42,
                 from /usr/include/c++/4.8.2/ios:41,
                 from /usr/include/c++/4.8.2/ostream:38,
                 from /usr/include/c++/4.8.2/iostream:39,
                 from Main.cc:1:
/usr/include/ctype.h:114:1: error:   initializing argument 1 of 'int isdigit(int)' [-fpermissive]
 __exctype (isdigit);
 ^