foo.cpp:4:1: error: expected ',' or ';' before 'long'
foo.cpp: In function 'int main()':
foo.cpp:10:10: error: 'n' was not declared in this scope
foo.cpp:13:18: error: 'a' was not declared in this scope
foo.cpp:16:10: error: 'a' was not declared in this scope
foo.cpp:16:19: error: 'sort' was not declared in this scope
foo.cpp:20:45: error: 'abs' was not declared in this scope
foo.cpp:23:26: error: 'b2' was not declared in this scope