I love compilers! I cannot code without them. They can prevent entire classes of errors and warns if I accidentally try to do something stupid in the code. Warnings Besides compiling code and checking for type and syntax errors, compilers can also print useful warnings. I’m a fan of turning on all warnings and writing a “paranoidly” safe code just to avoid potential correctness and performance problems. While coding in C/C++, I use to use gcc with flag -Wall.