File Input Output MCQ

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• scanf() is a predefined function in. . . . . . . .header file.
  ক

  stdlib. h

  খ

  ctype. h

  গ

  stdio. h

  ঘ

  stdarg. h
• In a variable length argument function, the declaration "..." can . . . . . . . .
  ক

  Appear anywhere in the function declaration

  খ

  Only appear at the end of an argument list

  গ

  Nothing

  ঘ

  None of the mentioned
• What form the data must be entered for the given C code?<br><pre><code class="c-program">scanf(“%d / %d”, &amp;n1,&amp;n2);</code></pre>
  ক

  6   9

  খ

  6/9

  গ

  compile error

  ঘ

  run-time error
• Within main, return expr statement is equivalent to . . . . . . . .
  ক

  abort(expr)

  খ

  exit(expr)

  গ

  ferror(expr)

  ঘ

  none of the mentioned
• The syntax of printf() function is printf("control string", variable list) ;what is the prototype of the control string?
  ক

  %specifier

  খ

  %specifier

  গ

  %specifier

  ঘ

  %specifier
• fflush(NULL) flushes all . . . . . . . .
  ক

  input streams

  খ

  output streams

  গ

  previous contents

  ঘ

  appended text
• putchar(c) function/macro always outputs character c to the . . . . . . . .
  ক

  screen

  খ

  standard output

  গ

  depends on the compiler

  ঘ

  depends on the standard
• What will the given code result is<br><pre><code class="c-program">printf("\n you are\"awesome \" ");</code></pre>
  ক

  compile error

  খ

  run-time error

  গ

  you are "awesome"

  ঘ

  you are awesome
• The following C expression can be substituted for?<br><pre><code class="c-program">if (isalpha(c) &amp;&amp; isdigit(c))</code></pre>
  ক

  if (isalnum(c))

  খ

  if (isalphanum(c))

  গ

  if (isalphanumeric(c))

  ঘ

  none of the mentioned
• What does the following command line signify?<br><pre><code class="c-program">prog1|prog2</code></pre>
  ক

  It runs prog1 first, prog2 second

  খ

  It runs prog2 first, prog1 second

  গ

  It runs both the programs, pipes output of prog1 to input of prog2

  ঘ

  It runs both the programs, pipes output of prog2 to input of prog1
• The . . . . . . . . function reads atmost one less than the number of characters specified by size from the given stream and it is stored in the string str.
  ক

  fget()

  খ

  fgets()

  গ

  fput()

  ঘ

  fputs()
• A conversion specification %7.4f means . . . . . . . .
  ক

  print a floating point value of maximum 7 digits where 4 digits are allotted for the digits after the decimal point

  খ

  print a floating point value of maximum 4 digits where 7digits are allotted for the digits after the decimal point

  গ

  print a floating point value of maximum 7 digits

  ঘ

  print a floating point value of minimum 7 digits where 4 digits are allotted for the digits after the decimal point
• Which type of files can't be opened using fopen()?
  ক

  .txt

  খ

  .bin

  গ

  .c

  ঘ

  none of the mentioned
• Select the right explanation for the following C code snippet.<br><pre><code class="c-program">int fgetpos(FILE *stream, fpos_t *s)</code></pre>
  ক

  records the current position in stream in *s

  খ

  sets the file position for stream in *s

  গ

  positions stream at the position recorded in *s

  ঘ

  reads from stream into the array ptr
• In the following C program, every time program is run different numbers are generated.<br><pre><code class="c-program">#include &lt;stdio.h&gt;int main(){ srand(time(NULL)); printf("%d\n", rand()); return 0;}</code></pre>
  ক

  True

  খ

  False

  গ

  Depends on the platform

  ঘ

  Depends on the compiler
• Which is true about isalnum(c), where c is an int that can be represented as an unsigned?<br><pre><code class="c-program">char or EOF.isalnum(c) returns</code></pre>
  ক

  Non-zero if isalpha(c) or isdigit(c)

  খ

  0 if not isalpha(c) or not isdigit(c)

  গ

  Both Non-zero if isalpha(c) or isdigit(c) &amp; 0 if not isalpha(c) or not isdigit(c)

  ঘ

  None of the mentioned
• Identify X library function for line input and output in the following C code?<br><pre><code class="c-program">#include &lt;stdio.h&gt;int X(char *s, FILE *iop){ int c; while (c = *s++) putc(c, iop); return ferror(iop) ? EOF : 0;}</code></pre>
  ক

  getc

  খ

  putc

  গ

  fgets

  ঘ

  fputs
• Which of the following should be used for freeing the memory allocated in the following C code?<br><pre><code class="c-program">#include &lt;stdio.h&gt;struct p{ struct p *next; int x;};int main(){ struct p *p1 = (struct p*)malloc(sizeof(struct p)); p1-&gt;x = 1; p1-&gt;next = (struct p*)malloc(sizeof(struct p)); return 0;}</code></pre>
  ক

  [ <p><span>A. <pre><code class="c-program">free(p1);free(p1-&gt;next)</code></pre> <p><span>B. <pre><code class="c-program">free(p1-&gt;next);free(p1);</code></pre>

  খ

  <pre><code class="c-program">free(p1);</code></pre>

  গ

  all of the mentioned
• Select the right explanation to the given code.<br><pre><code class="c-program">printf(“%*. *f”, 5,4,5700);</code></pre>
  ক

  the minimum field width has to be 4, the precision is given to be 5, and the value to be displayed is 5700

  খ

  the minimum field width is 5, the precision is 4, and the value to be displayed is 5700

  গ

  compile error

  ঘ

  run-time error
• What if size is zero in the following C statement?<br><pre><code class="c-program">realloc(ptr, size)</code></pre>
  ক

  Allocate a memory location with zero length

  খ

  Free the memory pointed to by ptr

  গ

  Undefined behaviour

  ঘ

  Doesn't do any reallocation of ptr i.e. no operation
• What is the purpose of the C function?<br><pre><code class="c-program">int ferror(FILE *fp)</code></pre>
  ক

  They check for input errors

  খ

  They check for output errors

  গ

  They check for all types of errors

  ঘ

  They check for error in accessing the file
• . . . . . . . . is used to define the type and the interpretation of the value of the corresponding argument.
  ক

  precision

  খ

  specifiers

  গ

  flags

  ঘ

  decimal
• rand() and srand() functions are used . . . . . . . .
  ক

  To find sqrt

  খ

  For and operations

  গ

  For or operations

  ঘ

  To generate random numbers
• If by mistake you specify more number of arguments, the excess arguments will . . . . . . . .
  ক

  be ignored

  খ

  produce compile error

  গ

  produce run-time error

  ঘ

  produce logical error
• What will be the value of var for the following C statement?<br><pre><code class="c-program">var = strcmp("Hello", "World");</code></pre>
  ক

  -1

  খ

  0

  গ

  1

  ঘ

  strcmp has void return-type
• Which of the following will return a non-zero value when checked with isspace(c)?
  ক

  blank

  খ

  newline

  গ

  return

  ঘ

  all of the mentioned
• What does the C statement given below says?<br><pre><code class="c-program">scanf("%7s",ch);</code></pre>
  ক

  read string with minimum 7 characters.

  খ

  read string with maximum 7 characters

  গ

  read string exactly to 7 characters

  ঘ

  read string with any number of characters
• If the user enters 1 s 3.2, what value will be returned by the scanf()?<br><pre><code class="c-program">scanf("%d %f %c", &amp;a, &amp;b, &amp;c);</code></pre>
  ক

  1

  খ

  2

  গ

  3

  ঘ

  no return value
• Which of the following is the correct syntax for calling function ungetc?<br><pre><code class="c-program">Assume int c and FILE *fp</code></pre>
  ক

  ungetc(c,*fp);

  খ

  ungetc(c, fp);

  গ

  ungetc(fp, c);

  ঘ

  ungetc(*fp,c);
• For floating point numbers, the precision flag specifies the number of decimal places to be printed. When no precision modifier is specified, printf() prints . . . . . . . .
  ক

  six decimal positions

  খ

  five decimal positions

  গ

  four decimal positions

  ঘ

  three decimal positions