Getting a variable to be recognized in a loop

 Hello, I am stumped regarding a simple plsql program I'm trying to write. 

I want to write a plsql program that produces a basic report.  The report would display the list of all our tables in the datbased followed by their row count.

For example:

Table A  1000
Table B  12
Table C  187
"
etc...

"

Below is the code I used.  The main cursor works great but I'm having an issue with this line being executed within the loop:

 select count(*) into num_of_rows from table_name_rec.table_name ;

The last part of the above statement "table_name_rec.table_name" isn't being recognized.