Step 1: Initially the value of variable
i is '5'.
Loop 1:
while(i-- >= 0) here i = 5, this statement becomes
while(5-- >= 0) Hence the
while condition is satisfied and it prints '4'. (variable
'i' is decremented by
'1'(one) in previous while condition)
Loop 2:
while(i-- >= 0) here i = 4, this statement becomes
while(4-- >= 0) Hence the
while condition is satisfied and it prints '3'. (variable
'i' is decremented by
'1'(one) in previous while condition)
Loop 3:
while(i-- >= 0) here i = 3, this statement becomes
while(3-- >= 0) Hence the
while condition is satisfied and it prints '2'. (variable
'i' is decremented by
'1'(one) in previous while condition)
Loop 4:
while(i-- >= 0) here i = 2, this statement becomes
while(2-- >= 0) Hence the
while condition is satisfied and it prints '1'. (variable
'i' is decremented by
'1'(one) in previous while condition)
Loop 5:
while(i-- >= 0) here i = 1, this statement becomes
while(1-- >= 0) Hence the
while condition is satisfied and it prints '0'. (variable
'i' is decremented by
'1'(one) in previous while condition)
Loop 6:
while(i-- >= 0) here i = 0, this statement becomes
while(0-- >= 0) Hence the
while condition is satisfied and it prints '-1'. (variable
'i' is decremented by
'1'(one) in previous while condition)
Loop 7:
while(i-- >= 0) here i = -1, this statement becomes
while(-1-- >= 0) Hence the
while condition is not satisfied and loop exits.
The output of first while loop is 4,3,2,1,0,-1
Step 2: Then the value of variable i is initialized to '5' Then it prints a new line character(\n).
See the above Loop 1 to Loop 7 .
The output of second while loop is 4,3,2,1,0,-1
Step 3: The third while loop, while(i-- >= 0) here i = -1(because the variable 'i' is decremented to '-1' by previous while loop and it never initialized.). This statement becomes while(-1-- >= 0) Hence the while condition is not satisfied and loop exits.
Hence the output of the program is
4,3,2,1,0,-1
4,3,2,1,0,-1
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