Error(s), warning(s):

source_file.java:12: error: cannot find symbol
        rev=0;
        ^
  symbol:   variable rev
  location: class Rextester
source_file.java:17: error: cannot find symbol
        rev =rev*10+num%10;
        ^
  symbol:   variable rev
  location: class Rextester
source_file.java:17: error: cannot find symbol
        rev =rev*10+num%10;
             ^
  symbol:   variable rev
  location: class Rextester
source_file.java:24: error: cannot find symbol
        system.out.println("reverse integer is" +rev);
                                                 ^
  symbol:   variable rev
  location: class Rextester
source_file.java:24: error: package system does not exist
        system.out.println("reverse integer is" +rev);
              ^
5 errors