How to learn C language in order to answer the questions in competitive exams and interviews aspects?

Answer 1

https://www.sololearn.com/Discuss/816961/what-s-the-best-book-available-online-for-learning-c-programming/

Here is some resources I found. I haven't used all of them, so I can't confirm if they're all good or not, but you can be the judge of that. Hope it helps.

http://www.eskimo.com/~scs/cclass/notes/top.html
http://www.learn-c.org/
https://fresh2refresh.com/c-programming/
http://www.stat.cmu.edu/~brian/cprog.html
http://www.linuxtopia.org/online_books/programming_books/gnu_c_programming_tutorial/index.html
https://www.cprogramming.com/tutorial/c-tutorial.html
https://learncodethehardway.org/c/
http://www.knosof.co.uk/cbook/cbook.html
http://beej.us/guide/bgnet/
http://beej.us/guide/bgc/
http://www.brainbell.com/tutors/c/Advice_and_Warnings_for_C/
http://www.planetpdf.com/codecuts/pdfs/ooc.pdf
http://ramos.elo.utfsm.cl/~lsb/elo320/aplicaciones/aplicaciones/CursoC.pdf
http://www.kciti.edu/wp-content/uploads/2017/07/cprogramming_tutorial.pdf
http://www-personal.acfr.usyd.edu.au/tbailey/ctext/ctext.pdf
https://www.researchgate.net/publication/265116936_Programming_in_C_in_7_days
https://classes.soe.ucsc.edu/cmpe013/Spring10/notes/C%20Programming%20Guide.pdf
http://phy.ntnu.edu.tw/~cchen/pdf/ctutor.pdf
http://www.fromdev.com/2013/10/c-programming-tutorials.html
https://www.e-reading.club/bookreader.php/135186/Aitken%2C_Jones_-_Sams_Teach_Yourself_C_in_21_Days%2C_6th_Edition.pdf

^Those resources should suffice for now. Best of luck to you friend, and I hope it goes smooth for you!

Answer 2

Visit this site:
https://www.cprogramming.com/tutorial/c-tutorial.html