el.cpp: In function 'int main()': el.cpp:21: error: expected initializer before ':' token el.cpp:21: error: expected primary-expression before ')' token el.cpp:21: error: expected ';' before ')' token el.cpp:22: error: expected initializer before ':' token el.cpp:22: error: expected primary-expression before ')' token el.cpp:22: error: expected ';' before ')' token el.cpp:26: error: 'dx' was not declared in this scope el.cpp:29: error: 'dy' was not declared in this scope el.cpp:36: error: 'dx' was not declared in this scope el.cpp:37: error: 'dy' was not declared in this scope