Main.cc: In function ‘int main()’: Main.cc:8:5: error: ‘dx’ was not declared in this scope dx=1; ^~ Main.cc:8:5: note: suggested alternative: ‘d’ dx=1; ^~ d Main.cc:9:5: error: ‘dy’ was not declared in this scope dy=n; ^~ Main.cc:9:5: note: suggested alternative: ‘d’ dy=n; ^~ d