C Fundamentals MCQ

Test your knowledge with important C Fundamentals MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more C Fundamentals MCQs at Bissoy

• Which operators of the following have same precedence?<br><pre><code class="c-program">P. "!=", Q. "+=", R. "</code></pre>
  ক

  P and Q

  খ

  Q and R

  গ

  P and R

  ঘ

  P, Q and R
• Point out the error (if any) in the following C code?<br><pre><code class="c-program">#include&lt;stdio.h&gt;enum hello{ a,b,c;};main(){ enum hello m; printf("%d",m);}</code></pre>
  ক

  No error

  খ

  Error in the statement: a,b,c;

  গ

  Error in the statement: enum hello m;

  ঘ

  Error in the statement: printf("%d",m);
• What will be the data type of the result of the following operation?<br><pre><code class="c-program">(float)a * (int)b / (long)c * (double)d</code></pre>
  ক

  int

  খ

  long

  গ

  float

  ঘ

  double
• Which of the following declaration is illegal?
  ক

  char *str = "The quick brown fox jumps over the lazy dog";

  খ

  char str = "The quick brown fox jumps over the lazy dog";

  গ

  char str = "The quick brown fox jumps over the lazy dog";

  ঘ

  char str = "The quick brown fox jumps over the lazy dog";
• Which of the following is a User-defined data type?
  ক

  typedef int Boolean;

  খ

  typedef enum {Mon, Tue, Wed, Thu, Fri} Workdays;

  গ

  struct {char name, int age};

  ঘ

  all of the mentioned
• The following C code can be rewritten as . . . . . . . .<br><pre><code class="c-program">c = (n) ? a : b;</code></pre>
  ক

  if (!n)c = b;<br>else c = a;

  খ

  if (n else c = a;

  গ

  if (n &gt; 0)c = a;<br>else c = b;

  ঘ

  All of the mentioned
• All keywords in C are in . . . . . . . .
  ক

  LowerCase letters

  খ

  UpperCase letters

  গ

  CamelCase letters

  ঘ

  None of the mentioned
• In expression i = g() + f(), first function called depends on . . . . . . . .
  ক

  Compiler

  খ

  Associativiy of () operator

  গ

  Precedence of () and + operator

  ঘ

  Left to write of the expression
• What will be the value of the following C expression?<br><pre><code class="c-program">(x = foo()) != 1 considering foo() returns 2</code></pre>
  ক

  2

  খ

  True

  গ

  1

  ঘ

  0
• Which of the following is the correct order of evaluation for the given expression?<br><pre><code class="c-program">a = w % x / y * z;</code></pre>
  ক

  % / * =

  খ

  / * % =

  গ

  = % * /

  ঘ

  * % / =
• Which of the following format identifier can never be used for the variable var?<br><pre><code class="c-program">#include &lt;stdio.h&gt;int main(){ char *var = "The quick brown fox jumps over the lazy dog";}</code></pre>
  ক

  %f

  খ

  %d

  গ

  %c

  ঘ

  %s
• Comment on the following statement.<br><pre><code class="c-program">n = 1;printf("%d, %dn", 3*n, n++);</code></pre>
  ক

  Output will be 3, 2

  খ

  Output will be 3, 1

  গ

  Output will be 6, 1

  ঘ

  Output is compiler dependent
• What is the problem in the following variable declaration?<br><pre><code class="c-program">float 3Bedroom-Hall-Kitchen?;</code></pre>
  ক

  The variable name begins with an integer

  খ

  The special character '-'

  গ

  The special character '?'

  ঘ

  All of the mentioned
• While swapping 2 numbers what precautions to be taken care?<br><pre><code class="c-program">b = (b / a);a = a * b;b = a / b;</code></pre>
  ক

  Data type should be either of short, int and long

  খ

  Data type should be either of float and double

  গ

  All data types are accepted except for (char *)

  ঘ

  This code doesn't swap 2 numbers
• C99 standard guarantees uniqueness of . . . . . . . . characters for internal names.
  ক

  31

  খ

  63

  গ

  12

  ঘ

  14
• What will be the final values of i and j in the following C code?<br><pre><code class="c-program">#include &lt;stdio.h&gt;int x = 0;int f(){ if (x == 0) return x + 1; else return x - 1;}int g(){ return x++;}int main(){ int i = (f() + g()) || g(); int j = g() || (f() + g());}</code></pre>
  ক

  i value is 1 and j value is 1

  খ

  i value is 0 and j value is 0

  গ

  i value is 1 and j value is undefined

  ঘ

  i and j value are undefined
• Comment on the output of the following C code.<br><pre><code class="c-program">#include &lt;stdio.h&gt;int main(){ int i, n, a = 4; scanf("%d", &amp;n); for (i = 0; i </code></pre>
  ক

  Logical Shift left

  খ

  No output

  গ

  Arithmetic Shift right

  ঘ

  Bitwise exclusive OR
• What will be the final value of c in the following C code snippet? (Initial values: a = 1, b = 2, c = 1)<br><pre><code class="c-program">c += (-c) ? a : b;</code></pre>
  ক

  Syntax Error

  খ

  c = 1

  গ

  c = 2

  ঘ

  c = 3
• We want to create an alias name for an identifier of the type unsigned long. The alias name is: ul. The correct way to do this using the keyword typedef is . . . . . . . .
  ক

  typedef unsigned long ul;

  খ

  unsigned long typedef ul;

  গ

  typedef ul unsigned long;

  ঘ

  ul typedef unsigned long;
• What is the difference between the following 2 codes?<br><pre><code class="c-program">#include &lt;stdio.h&gt; //Program 2int main(){ int d, a = 1, b = 2; d = a++ +++b; printf("%d %d %d", d, a, b);}</code></pre>
  ক

  No difference as space doesn't make any difference, values of a, b, d are same in both the case

  খ

  Space does make a difference, values of a, b, d are different

  গ

  Program 1 has syntax error, program 2 is not

  ঘ

  Program 2 has syntax error, program 1 is not
• Which of the following is not a pointer declaration?
  ক

  char a;

  খ

  char a = {'1', '2', '3', '4'};

  গ

  char *str;

  ঘ

  char a;
• Comment on the behaviour of the following C code?<br><pre><code class="c-program">#include &lt;stdio.h&gt;int main(){ int i = 2; i = i++ + i; printf("%d\n", i);}</code></pre>
  ক

  = operator is not a sequence point

  খ

  ++ operator may return value with or without side effects

  গ

  it can be evaluated as (i++)+i or i+(++i)

  ঘ

  = operator is a sequence point
• Which function in the following expression will be called first?<br><pre><code class="c-program">a = func3(6) - func2(4, 5) / func1(1, 2, 3);</code></pre>
  ক

  func1();

  খ

  func2();

  গ

  func3();

  ঘ

  Cannot be predicted
• Consider this statement: typedef enum good {a, b, c} hello; Which of the following statements is incorrect about hello?
  ক

  hello is a typedef of enum good

  খ

  hello is a structure

  গ

  hello is a variable of type enum good

  ঘ

  the statement shown above is erroneous
• What will be the final value of c in the following C statement? (Initial value: c = 2)<br><pre><code class="c-program">c </code></pre>
  ক

  c = 1;

  খ

  c = 2;

  গ

  c = 3;

  ঘ

  c = 4;
• What is the type of the following assignment expression if x is of type float and y is of type int?<br><pre><code class="c-program">y = x + y;</code></pre>
  ক

  int

  খ

  float

  গ

  there is no type for an assignment expression

  ঘ

  double
• What will be the final value of x in the following C code?<br><pre><code class="c-program">#include &lt;stdio.h&gt;void main(){ int x = 5 * 9 / 3 + 9;}</code></pre>
  ক

  3.75

  খ

  Depends on compiler

  গ

  24

  ঘ

  3
• Which expression has to be present in the following?<br><pre><code class="c-program">exp1 ? exp2 : exp3;</code></pre>
  ক

  exp1

  খ

  exp2

  গ

  exp3

  ঘ

  all of the mentioned
• C99 standard guarantees uniqueness of . . . . . . . . characters for external names.
  ক

  31

  খ

  6

  গ

  12

  ঘ

  14
• Point out the error( if any) in the following code.<br><pre><code class="c-program">#include&lt;stdio.h&gt;enum India{ a,b,c};enum India g;main(){ g++; printf("%d",g);}</code></pre>
  ক

  Error in the statement: a,b,c

  খ

  Error in the statement: enum India g;

  গ

  Error in the statement: g++

  ঘ

  No error