View Compilation Error

0_0_39575085_3102.cpp: In function 'int main()':
0_0_39575085_3102.cpp:4:5: error: 'p' was not declared in this scope
    4 |     p
      |     ^
0_0_39575085_3102.cpp:12:5: error: 'rern' was not declared in this scope
   12 |     rern 0
      |     ^~~~