Quiz: The basics of C

If you haven't already done so, be sure to read through Cprogramming.com's introduction to C. Otherwise, best of luck with the quiz! 

1. What is the correct value to return to the operating system upon the successful completion of a program? A. -1  B. 1  C. 0  D. Programs do not return a value. 2. What is the only function all C programs must contain? A. start() B. system()  C. main()  D. program() 3. What punctuation is used to signal the beginning and end of code blocks? A. { }  B. -> and <-  C. BEGIN and END  D. ( and )  4. What punctuation ends most lines of C code? A. .  B. ;  C. :  D. '  5. Which of the following is a correct comment? A. */ Comments */ B. ** Comment ** C. /* Comment */ D. { Comment } 6. Which of the following is not a correct variable type? A. float B. real C. int D. double 7. Which of the following is the correct operator to compare two variables? A. := B. = C. equal D. ==

answer：ccabcbd