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Home C Programming Control Instructions See What Others Are Saying!
  • Question
  • What will be the output of the program?
    #include<stdio.h>
    int main()
    {
        int i = 5;
        while(i-- >= 0)
            printf("%d,", i);
        i = 5;
        printf("\n");
        while(i-- >= 0)
            printf("%i,", i);
        while(i-- >= 0)
            printf("%d,", i);
        return 0;
    }
    


  • Options
  • A. 4, 3, 2, 1, 0, -1
    4, 3, 2, 1, 0, -1
  • B. 5, 4, 3, 2, 1, 0
    5, 4, 3, 2, 1, 0
  • C. Error
  • D. 5, 4, 3, 2, 1, 0
    5, 4, 3, 2, 1, 0
    5, 4, 3, 2, 1, 0

  • Correct Answer
  • 4, 3, 2, 1, 0, -1
    4, 3, 2, 1, 0, -1 

    Explanation
    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


    More questions

    • 1. Bitwise | can be used to set a bit in number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 2. Can we have an array of bit fields?

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 3. By default structure variable will be of auto storage class

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 4. Bitwise can be used to reverse a sign of a number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 5. Is it necessary that in a function which accepts variable argument list there should be at least be one fixed argument?

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 6. Bitwise can be used to generate a random number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 7. A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. Bitwise & can be used to check if more than one bit in a number is on.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. It is necessary that a header files should have a .h extension?

    • Options
    • A. Yes
    • B. No
    • Discuss


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