program which checks the answers to a test-paper

i have to solve this problem and i dont know how:
At an exam the students have to answer 30 qustions with multiple choices (a,b,c..)
i have to make a program which checks the answers of the students. we introduce the correct answers to the test from the keyboard and the number of students which had the exam after that the answers of each student with his name . if the students solve at least 60% of the questions the program should write the student promoted the exam else it should write that the student failed it. i could solvec it but my teacher told me to solve it thinking of that a qustion may have more than one answer that a student may not write the answer and that there may be spaces between answers all the data is introduced from the keyboard. please help me solve it!
No one will do your homework for you, so please dont ask "solve my problem".
http://www.cplusplus.com/forum/articles/1295/

i could solvec it


Start with what you can do and if you cant figure someting out, you can ask about it here.
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