What does "undefined reference to 'PrintList'" or "undefined reference to 'InsertAtRoot'" mean after compiling in the C programming language? Thanks.

This occurs when the function declaration and the function definition do not match. As the function, the prototype can be PrintList(D*) and the function definition might have been listed like void PrintList(). And this is the reason why the declaration and the definition are not matching. The same thing must have occurred with the InsertAtRoot, and in all such cases, this error message is being shown after the compilation of the C program in the C programming language.

Explanation:

Please check the answer section.

i would first let him be aware that a cover letter is official and confidential and it requires a proper formatting so that the employer doesn't have hard time when going through it. he should write it in paragraphs of about two to four sentences and use proper grammar a , spelling and proper punctuation. i will also advice him not to be emotional and not also to use images.then base his attention to the details of the job described and not other things. that is he be specific to the responsibilities and to the employers requirements. on this he should make sure that the letter reflects how good he is for the requirements detailed by the employer

the letter should not be too long nor too short.