int main() { FILE *fs, *ft; char c[10]; fs = fopen("s"> int main() { FILE *fs, *ft; char c[10]; fs = fopen("s">
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  • Question

  • If the file 'source.txt' contains a line "Be my friend" which of the following will be the output of below program? 
    #include<stdio.h>

int main()
{
    FILE *fs, *ft;
    char c[10];
    fs = fopen("source.txt", "r");
    c[0] = getc(fs);
    fseek(fs, 0, SEEK_END);
    fseek(fs, -3L, SEEK_CUR);
    fgets(c, 5, fs);
    puts(c);
    return 0;
}


  • Options
  • A. friend
  • B. frien
  • C. end
  • D. Error in fseek();

  • Correct Answer
  • end 

    Explanation
    The file source.txt contains "Be my friend".

    fseek(fs, 0, SEEK_END); moves the file pointer to the end of the file.

    fseek(fs, -3L, SEEK_CUR); moves the file pointer backward by 3 characters.

    fgets(c, 5, fs); read the file from the current position of the file pointer.

    Hence, it contains the last 3 characters of "Be my friend".

    Therefore, it prints "end".

    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.

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

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

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

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

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

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    • A. Yes
    • B. No
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