In a computer class, one student getting bored of the lectures started throwing airplane papers on the teacher.
Teacher : Stop that mischief and gives punishment to the student to write on the blackboard 500 times that "I will not throw paper airplanes in class"
Student : (stands up) Goes to the blackboard and writes
for (count=1; count <= 500; count ++)
printf ("I will not throw paper airplanes in class.");