I provided answer for some questions .........


Question 3,
Trim the space between ur function name and arguments
putchar (c) can be replaced as putchar(c) for better result


Question 4
Answer is ABC\4(4 indicates no of characters printed)

Question 7

p=&a[3], so p[0]=7,p[1]=5,p[-1]=1,p[-2]=4,p[-3]=9


Remaing questions(Eventhough this too)questions were simple in nature........
if u had any more doubts..........
Mail me......