/in/foo.cc: In function 'int main()':
/in/foo.cc:9:9: error: 'strlen' was not declared in this scope
    9 |     len=strlen(ch);
      |         ^~~~~~
/in/foo.cc:2:1: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | #include<string>
/in/foo.cc:19:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   19 | int main() {
      |         ^~
/in/foo.cc:19:9: note: remove parentheses to default-initialize a variable
   19 | int main() {
      |         ^~
      |         --
/in/foo.cc:19:9: note: or replace parentheses with braces to value-initialize a variable
/in/foo.cc:19:12: error: a function-definition is not allowed here before '{' token
   19 | int main() {
      |            ^
/in/foo.cc:33:2: error: expected '}' at end of input
   33 | }
      |  ^
/in/foo.cc:5:1: note: to match this '{'
    5 | {
      | ^