Prerequisite :
While loops
Q.1 What is the output of this program?
Option
a) 3 2 1 0
b) 2 1 0 -1
c) infinite loop
d) -65535
Answer : C
Explanation: Here x is an unsigned integer andit can never become negative. So the expression x-->=0 will always be true, so its a infinite loop.
Q.2 What is the output of this program?
option:- a
a) 3 2 1 0
b) 2 1 0 -1
c) infinite loop
d) -65535
Answer: b
Explanation: Here x is an integer with value 3. Loop runs till x>=0 ; 2, 1, 0 will be printed and after x>=0, condition becomes true again and print -1 after false.
Q.3 What is the output of this program?
option
a) 1
b) 0
c) -1
d) infinite
Answer : C
Explanation Unary + is the only dummy operator in c++. So it has no effect on the expression.
Q.4 What is the output of this program?
option
a) 0
b) 1
c) -1
d) infinite
Answer: b
Explanation: The semicolon is after the while loop. while the value of x become 0, it comes out of while loop. Due to post-increment on x the value of x while printing becomes 1.
Q.5 What is the output of this program?
