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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()
    {
        char ch;
        if(ch = printf(""))
            printf("It matters\n");
        else
            printf("It doesn't matters\n");
        return 0;
    }
    


  • Options
  • A. It matters
  • B. It doesn't matters
  • C. matters
  • D. No output

  • Correct Answer
  • It doesn't matters 

    Explanation
    printf() returns the number of charecters printed on the console.

    Step 1: if(ch = printf("")) here printf() does not print anything, so it returns '0'(zero).
    Step 2: if(ch = 0) here variable ch has the value '0'(zero).
    Step 3: if(0) Hence the if condition is not satisfied. So it prints the else statements.
    Hence the output is "It doesn't matters".

    Note: Compiler shows a warning "possibly incorrect assinment".


    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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