foo.cpp: In function 'int main()':
foo.cpp:4:5: error: 'cin' was not declared in this scope
foo.cpp:6:14: error: 'q' was not declared in this scope
foo.cpp:18:8: error: 'q' was not declared in this scope
foo.cpp:22:9: error: 'q' was not declared in this scope
foo.cpp:26:5: error: 'cout' was not declared in this scope
foo.cpp:26:16: error: 'endl' was not declared in this scope
foo.cpp:3:13: warning: unused variable 'j' [-Wunused-variable]