Explore topic-wise MCQs in C Programming.

This section includes 91 Mcqs, each offering curated multiple-choice questions to sharpen your C Programming knowledge and support exam preparation. Choose a topic below to get started.

51.

What will be the output of the following C code?#include <stdio.h> typedef struct N *ptr2; struct N { int n1; char n2; ptr2 ptr1; }; int main() { struct N n = {111, 222, &n}; printf("%d n", n.ptr1->ptr1->n1); return 0; }

A. 111
B. 222
C. Compilation Error
D. Garbage value
E. None of these
Answer» B. 222
Discussion
52.

What will be the output of the following C code? #include <stdio.h> int main() { typedef struct B *ptr; struct B { int num1; char num2; ptr ptr1; }; struct B b = {15, 25, &b}; printf("%d n", b.ptr1->num1); return 0; }

A. 25
B. Compilation Error
C. Garbage value
D. 15
E. None of these
Answer» E. None of these
Discussion
53.

Can the following C code be compiled successfully?#include <stdio.h> struct A { int p; char q; float r; }; int main() { struct A t = {.q = 15, .r = 13, .p = 23}; printf("%f n", t.r); }

A. Depends on the standard
B. No
C. Depends on the platform
D. Yes
E. None of these
Answer» E. None of these
Discussion
54.

What will be the output of the following C code?#include <stdio.h> void main() { struct Employee { int id; char Name[26]; }; struct Employee emp; id = 1001; printf("%d", id); }

A. Garbage value
B. Nothing
C. Compilation Error
D. 1001
E. None of these
Answer» D. 1001
Discussion
55.

What will be the output of the following C code?#include <stdio.h> void main() { struct Clothes { int size; char Brand_name[50]; }; struct Clothes c; c.size = 40; printf("%d", c.size); }

A. Compilation Error
B. Garbage value
C. 40
D. Undefined behaviour
E. None of these
Answer» D. Undefined behaviour
Discussion
56.

What will be the output of the following C code?#include <stdio.h> struct Clothes { int size; char Brand_name[50]; }; void main() { Clothes c; c.size = 39; printf("Jockey"); }

A. Jockey
B. 39
C. Compilation Error
D. Garbage value
E. None of these
Answer» D. Garbage value
Discussion
57.

What will be the output of the following C code?#include <stdio.h> struct Country { int code = 12; char name[20]; }; void main() { struct Country c; c.code = 15; printf("England"); }

A. Compilation Error
B. Nothing
C. England
D. 15
E. None of these
Answer» B. Nothing
Discussion
58.

What will be the output of the following C code?#include <stdio.h> typedef struct p *q; int main() { struct p { int num1; char num2; q ptr; }; struct p p = {50, 55, &p}; printf("%d n", p.ptr->x); return 0; }

A. 50
B. 55
C. Compilation Error
D. Garbage value
E. None of these
Answer» D. Garbage value
Discussion
59.

What will be the output of the following C code?#include <stdio.h> typedef struct p *q; struct p { int n1; char n2; q ptr; }; typedef struct p *q; int main() { struct p p = {101, 202, &p}; printf("%d n", p.ptr->n1); return 0; }

A. Compilation Error
B. Garbage value
C. 101
D. 202
E. None of these
Answer» D. 202
Discussion
60.

What will be the output of the following C code?#include <stdio.h> struct Number { int n1; int n2; }; void function(struct Number*); int main() { struct Number num1[] = {15, 25, 35, 45}; function(num1); } void function(struct Number num2[]) { printf("%d n", num2->n1); }

A. 15
B. 25
C. 35
D. 45
E. None of these
Answer» B. 25
Discussion
61.

What will be the output of the following C code? #include <stdio.h> struct Option { int a; int b; }; void fun(struct Option*); int main() { struct Option opt1[] = {13, 23, 33, 43}; fun(opt1); } void fun(struct Option opt2[]) { printf("%d n", opt2[1].a); }

A. 13
B. 23
C. 33
D. 43
E. None of these
Answer» D. 43
Discussion
62.

What will be the output of the following C code?#include <stdio.h> struct City { }; void main() { struct City c[2]; printf("%d", sizeof(c)); }

A. 0
B. 2
C. 4
D. 8
E. None of these
Answer» B. 2
Discussion
63.

What will be the output of the following C code?#include <stdio.h> struct student { char *name; }; void main() { struct student s1[2], s2[2]; s1[1] = s1[0] = "Ajit Kumar Gupta"; printf("%s %s", s1[0].name, s1[1].name); }

A. Compilation Error
B. Garbage value
C. Ajit Kumar Gupta
D. Undefined behaviour
E. None of these
Answer» B. Garbage value
Discussion
64.

What will be the output of the following C code?#include <stdio.h> struct Worker { char *name; }; struct Worker w1[2], w2[2]; void main() { w1[0].name = "Imaraj"; w1[1] = w1[0]; w2 = w1; printf("%s%s", w2[0].name, w2[1].name); }

A. Imaraj
B. Compilation Error
C. Garbage value
D. Nothing
E. None of these
Answer» C. Garbage value
Discussion
65.

What will be the output of the following C code?#include <stdio.h> struct Condition { int n1; char n2; }; int main() { struct Condition con1[] = {11, 91, 31, 14, 15, 16}; struct Condition *ptr1 = con1; int n1 = (sizeof(con1) / sizeof(ptr1)); if (n1 == 1) printf("%d n", ptr1->n1); else printf("False n"); }

A. False
B. Compilation Error
C. Garbage value
D. Nothing
E. None of these
Answer» B. Compilation Error
Discussion
66.

What will be the output of the following C code?#include <stdio.h> struct Company { int c1; char c2; }; int main() { struct Company comp1[] = {10, 91, 30, 90, 52, 95}; struct Company *ptr1 = comp1; int c1 = (sizeof(comp1) / 3); if (c1 == sizeof(int) + sizeof(char)) printf("%d n", ptr1->c1); else printf("Interview Mania"); }

A. Compilation Error
B. Garbage value
C. Interview Mania
D. Nothing
E. None of these
Answer» D. Nothing
Discussion
67.

What will be the output of the following C code?#include <stdio.h> struct alphabet { char *ch; }; void main() { struct alphabet alp[2]; printf("%d", sizeof(alp)); }

A. 16
B. 8
C. 4
D. 2
E. None of these
Answer» B. 8
Discussion
68.

What is the output of this C code?#include <stdio.h> struct Employee { char *name; }; void main() { struct Employee emp1, emp2; emp1.name = "Ajit"; emp2 = emp1; printf("%s %s", emp1.name, emp2.name); }

A. Ajit Ajit
B. Garbage value
C. Compilation Error
D. Nothing
E. None of these
Answer» B. Garbage value
Discussion
69.

What will be the output of the following C code according to C99 standard?#include <stdio.h> struct stru { int i; char ch; float flt; }; int main() { struct stru Res = {.ch = 333}; printf("%f n", Res.flt); }

A. 333.000000
B. Compilation Error
C. Garbage value
D. 0.000000
E. None of these
Answer» E. None of these
Discussion
70.

What will be the output of the following C code according to C99 standard? #include <stdio.h> struct S { int i; char ch; float flt; }; int main() { struct S R = {.ch = 45, .i = 11, 31}; printf("%f n", R.flt); }

A. 31.000000
B. Compilation Error
C. Garbage value
D. Undefined behabiour
E. 0.000000
Answer» F.
Discussion
71.

What will be the output of the following C code according to C99 standard?#include <stdio.h> struct stru { int m; char n; float t; }; int main() { struct stru R = {.n = 99, .t = 13, .m = 21}; printf("%f n", R.t); }

A. Compilation Error
B. 13.000000
C. Garbage value
D. Undefined behaviour
E. None of these
Answer» C. Garbage value
Discussion
72.

Which of the following structure declaration is incorrect ?

A. <pre class="prettyprint lang-c">struct aa<br>{<br> int a;<br> float b;<br>};<br></pre>
B. <pre class="prettyprint lang-c">struct aa<br>{<br> int a;<br> float b;<br> struct aa var;<br>};<br></pre>
C. <pre class="prettyprint lang-c">struct aa<br>{<br> int a;<br> float b;<br> struct aa *var;<br>};<br></pre>
D. <pre class="prettyprint lang-c">struct aa<br>{<br> int a;<br> float b;<br> struct aa **var;<br>};<br></pre>
Answer» C. <pre class="prettyprint lang-c">struct aa<br>{<br> int a;<br> float b;<br> struct aa *var;<br>};<br></pre>
Discussion
73.

Which of the following is the correct output fot the program given below?

A. 0 0.000000
B. Garbage values
C. Error
D. None of the above
Answer» B. Garbage values
Discussion
74.

Which of the following structure declaration is correct ?

A. <pre class="prettyprint lang-c">struct employ<br>{<br> char name[10];<br> float salary;<br> int workingdays;<br>};<br></pre>
B. <pre class="prettyprint lang-c">struct employ<br>{<br> char name[10];<br> float salary;<br> int workingdays;<br>}<br></pre>
C. <pre class="prettyprint lang-c">struct employ<br>{<br> char name[10]<br> float salary<br> int workingdays<br>};<br></pre>
D. All of the above.
Answer» B. <pre class="prettyprint lang-c">struct employ<br>{<br> char name[10];<br> float salary;<br> int workingdays;<br>}<br></pre>
Discussion
75.

Which of the following will stop the loop at the last node of a linked list in the following C code snippet?

A. <pre class="prettyprint lang-c">while (p-&gt;next != NULL)<br> {<br> p = p-&gt;next;<br> }<br></pre>
B. <pre class="prettyprint lang-c">while (1)<br> {<br> p = p-&gt;next;<br> if (p == NULL)<br> break;<br> }<br></pre>
C. <pre class="prettyprint lang-c">while (p != NULL)<br> {<br> p = p-&gt;next;<br> }<br></pre>
D. All of above
E. None of these
Answer» B. <pre class="prettyprint lang-c">while (1)<br> {<br> p = p-&gt;next;<br> if (p == NULL)<br> break;<br> }<br></pre>
Discussion
76.

Presence of code like s.t.b = 100 indicates __________.

A. double data type
B. Syntax Error
C. Structure
D. All of above
E. None of these
Answer» D. All of above
Discussion
77.

Presence of loop in a linked list can be tested by ________.

A. Comparing the address of nodes by address of every other node
B. Comparing the the value stored in a node by a value in every other node
C. Traveling the list, if NULL is encountered no loop exists
D. All of above
E. None of these
Answer» B. Comparing the the value stored in a node by a value in every other node
Discussion
78.

What will be the output of the following C code according to C99 standard?

A. Compilation Error
B. 13.000000
C. Garbage value
D. Undefined behaviour
E. None of these
Answer» C. Garbage value
Discussion
79.

The number of distinct nodes the following struct declaration can point to is _____________.

A. 3
B. 2
C. 1
D. All of above
E. None of these
Answer» E. None of these
Discussion
80.

How many bytes in memory taken by the following C structure?

A. Multiple of word size
B. Depends on the platform
C. integer size+character size
D. Multiple of integer size
E. None of these
Answer» E. None of these
Discussion
81.

Which option is not possible for the following function call?

A. Individual member can be passed by reference in a function
B. Individual member s address can be displayed in structure
C. Compiler can access entire structure from the function
D. All of above
E. None of these
Answer» D. All of above
Discussion
82.

Can the following C code be compiled successfully?

A. Depends on the standard
B. No
C. Depends on the platform
D. Yes
E. None of these
Answer» E. None of these
Discussion
83.

Which of the following structure declaration doesn t require pass-by-reference?

A. <pre class="prettyprint lang-c">struct temp{int a;};<br> main(){}<br> struct temp s;<br></pre>
B. <pre class="prettyprint lang-c">struct{int a;}s;<br> main(){}<br></pre>
C. <pre class="prettyprint lang-c">struct temp{int a;};<br> main(){<br> struct temp s;<br> }<br></pre>
D. All of above
E. None of these
Answer» F.
Discussion
84.

Which of the following is an incorrect syntax to pass by reference a member of a structure in a function?

A. func(&(e).num);
B. func(&(e.num));
C. func(&e.num);
D. All of above
E. None of these
Answer» F.
Discussion
85.

The correct syntax to access the member of the ith structure in the array of structures is?

A. sct[j].n;
B. sct.n[j];
C. sct.[j].n;
D. sct.n.[j];
E. None of these
Answer» B. sct.n[j];
Discussion
86.

Which of the following is an incorrect syntax for pointer to structure?

A. (*ptr_struct).n = 110;
B. ptr_struct->n = 110;
C. *ptr_struct.n = 110;
D. Both (*ptr_struct).n = 110; and *ptr_struct.n = 110;
E. None of these
Answer» D. Both (*ptr_struct).n = 110; and *ptr_struct.n = 110;
Discussion
87.

What will be the output of the following C code? (Assuming size of int be 4)

A. 16
B. 12
C. 4
D. Compilation Error
E. None of these
Answer» C. 4
Discussion
88.

What is the correct syntax to declare a function fun() which receives an array of structure in function?

A. void fun(struct *num[]);
B. void fun(struct num);
C. void fun(struct *num);
D. All of above
E. None of these
Answer» D. All of above
Discussion
89.

Comment on the output of the following C code.

A. No Compile time error, generates an array of structure of size 9
B. Compile time error, illegal declaration of a multidimensional array
C. Compile time error, illegal assignment to members of structure
D. No Compile time error, generates an array of structure of size 3
E. None of these
Answer» E. None of these
Discussion
90.

Which of the following structure declaration will throw an error?

A. <pre class="prettyprint lang-c">struct temp{};<br> struct temp s;<br> main(){}<br></pre>
B. <pre class="prettyprint lang-c">struct temp s;<br> struct temp{};<br> main(){}<br></pre>
C. <pre class="prettyprint lang-c">struct temp{}s;<br> main(){}<br></pre>
D. All of above
E. None of these
Answer» F.
Discussion
91.

User-defined data type can be derived by___________.

A. enum
B. typedef
C. struct
D. All of above
E. None of these
Answer» E. None of these
Discussion