Declare a stack of integers

while ( there are more integers in the string to read ) 
{ 
   read a integer 
   push the integer on the stack 
} 
while ( the stack is not empty ) 
{ 
   pop a integer off the stack 
   write the integer to the screen 
}  

What is the output for \”123456789\”
(A) 123456789123456789
(B) 987654321
(C) 987654321123456789
(D) 123456789


Answer: (B)

Explanation:
Since the stack data structure follows LIFO order. When we pop() items from stack, they are popped in reverse order of their insertion (or push()).