Explore topic-wise MCQs in C Interview.

This section includes 278 Mcqs, each offering curated multiple-choice questions to sharpen your C Interview knowledge and support exam preparation. Choose a topic below to get started.

51.

Variable name resolving (number of significant characters for uniqueness of variable) depends on

A. Compiler and linker implementations
B. Assemblers and loaders implementations
C. C language
D. None
Answer» B. Assemblers and loaders implementations
Discussion
52.

Variable names beginning with underscore is not encouraged. Why?

A. It is not standardized
B. To avoid conflicts since assemblers and loaders use such names
C. To avoid conflicts since library routines use such names
D. To avoid conflicts with environment variables of an operating system
Answer» D. To avoid conflicts with environment variables of an operating system
Discussion
53.

What is the output of this C code(according to C99 standard)? #include struct p { int k; char c; float f; }; int main() { struct p x = {.c = 97}; printf("%f\n", x.f); }

A. 0.000000
B. Some garbage value
C. Compile time error
D. None of the mentioned
Answer» B. Some garbage value
Discussion
54.

What is the output of this C code(according to C99 standard)? #include struct p { int k; char c; float f; }; int main() { struct p x = {.c = 97, .k = 1, 3}; printf("%f \n", x.f); }

A. 3.000000
B. 0.000000
C. Compile time error
D. Undefined behaviour
Answer» C. Compile time error
Discussion
55.

What is the output of this C code? #include struct p { int k; char c; }; int p = 10; int main() { struct p x; x.k = 10; printf("%d %d\n", x.k, p); }

A. Compile time error
B. 10 10
C. Depends on the standard
D. Depends on the compiler
Answer» C. Depends on the standard
Discussion
56.

What is the output of this C code(according to C99 standard)? #include struct p { int k; char c; float f; }; int main() { struct p x = {.c = 97, .f = 3, .k = 1}; printf("%f\n", x.f); }

A. 3.000000
B. Compile time error
C. Undefined behaviour
D. 1.000000
Answer» B. Compile time error
Discussion
57.

What is the output of this C code?#include struct p { int k; char c; float f; }; int p = 10; int main() { struct p x = {1, 97}; printf("%f %d\n", x.f, p); }

A. Compile time error
B. 0.000000 10
C. Somegarbage value 10
D. 0 10
Answer» C. Somegarbage value 10
Discussion
58.

What is the output of this C code? #include struct { int k; char c; } p; int p = 10; int main() { p.k = 10; printf("%d %d\n", p.k, p); }

A. Compile time error
B. 10 10
C. Depends on the standard
D. Depends on the compiler
Answer» B. 10 10
Discussion
59.

What is the output of this C code? #include struct { int k; char c; }; int main() { struct p; p.k = 10; printf("%d\n", p.k); }

A. Compile time error
B. 10
C. Undefined behaviour
D. Segmentation fault
Answer» B. 10
Discussion
60.

Number of bytes in memory taken by the below structure is #include struct test { int k; char c; };

A. Multiple of integer size
B. integer size+character size
C. Depends on the platform
D. Multiple of word size
Answer» B. integer size+character size
Discussion
61.

Can the below code be compiled successfully? #include struct p { int k; char c; float f; }; int main() { struct p x = {.c = 97, .f = 3, .k = 1}; printf("%f\n", x.f); }

A. Yes
B. No
C. Depends on the standard
D. Depends on the platform
Answer» D. Depends on the platform
Discussion
62.

What is the output of this C code? #include void main() { struct student { int no; char name[20]; }; struct student s; no = 8; printf("%d", no); }

A. Nothing
B. Compile time error
C. Junk
D. 8
Answer» C. Junk
Discussion
63.

What is the output of this C code? #include

A. Nothing
B. Compile time error
C. Junk
D. 8
Answer» E.
Discussion
64.

What is the output of this C code? #include struct student { int no; char name[20]; }; void main() { student s; s.no = 8; printf("hello"); }

A. Nothing
B. hello
C. Compile time error
D. Varies
Answer» D. Varies
Discussion
65.

What is the output of this C code? #include struct student { int no; char name[20]; } void main() { struct student s; s.no = 8; printf("hello"); }

A. Compile time error
B. Nothing
C. hello
D. Varies
Answer» B. Nothing
Discussion
66.

What is the output of this C code? #include struct student { int no = 5; char name[20]; }; void main() { struct student s; s.no = 8; printf("hello"); }

A. Nothing
B. Compile time error
C. hello
D. Varies
Answer» C. hello
Discussion
67.

Which of the following cannot be a structure member?

A. Another structure
B. Function
C. Array
D. None of the mentioned
Answer» C. Array
Discussion
68.

Which operator connects the structure name to its member name?

A. –
B. <-
C. .
D. Both <- and .
Answer» D. Both <- and .
Discussion
69.

User-defined data type can be derived by___________

A. struct
B. enum
C. typedef
D. all of the mentioned
Answer» E.
Discussion
70.

Which of the following are themselves a collection of different data types?

A. string
B. structures
C. char
D. all of the mentioned
Answer» C. char
Discussion
71.

What will be the output of the program ? #include int main() { int arr[1] = {10}; printf("%d", 0[arr]); return 0; }

A. 1
B. 0
C. 10
D. 6
Answer» D. 6
Discussion
72.

What will be the output of the program if the array begins at 65472 and each integer occupies 2 bytes? #include void main() { int a[3][4] = {1, 2, 3, 4, 4, 3, 2, 1, 7, 8, 9, 0}; printf("%u, %u", a+1, &a+1); }

A. 65474, 65488
B. 65480, 65488
C. 65480, 65496
D. 65474, 65476
Answer» D. 65474, 65476
Discussion
73.

What will be the output of the following code? void main() { int a[10]; printf("%d %d", a[-1], a[12]); }

A. 0 0
B. Garbage value 0
C. 0 Garbage Value
D. Garbage vlaue Garbage Value
Answer» E.
Discussion
74.

What will be the output of the following program? void main() { char str1[] = "abcd"; char str2[] = "abcd"; if(str1==str2) printf("Equal"); else printf("Unequal"); }

A. Equal
B. Unequal
C. Error
D. None of these.
Answer» C. Error
Discussion
75.

What will be printed after execution of the following code? void main() { int arr[10] = {1,2,3,4,5}; printf("%d", arr[5]); }

A. Garbage Value
B. 5
C. 6
D. 0
Answer» E.
Discussion
76.

Consider the following type definition. typedef char x[10]; x myArray[5]; What will sizeof(myArray) be ? (Assume one character occupies 1 byte)

A. 15
B. 10
C. 50
D. 30
Answer» D. 30
Discussion
77.

What will be the output of the program ? #include void main() { int a[5] = {5, 1, 15, 20, 25}; int i, j, m; i = ++a[1]; j = a[1]++; m = a[i++]; printf("%d, %d, %d", i, j, m); }

A. 3, 2, 15
B. 2, 3, 20
C. 2, 1, 15
D. 1, 2, 5
Answer» B. 2, 3, 20
Discussion
78.

What will be the output of following program code? #include int main(void) { char p; char buf[10] = {1, 2, 3, 4, 5, 6, 9, 8}; p = (buf + 1)[5]; printf("%d", p); return 0; }

A. 5
B. 6
C. 9
D. Error
Answer» D. Error
Discussion
79.

What is the output of this C code? #include int main() { char str[11] = "hello"; char *str1 = "world"; strcat(str, str1); printf("%s %d", str, str[10]); }

A. helloworld 0
B. helloworld anyvalue
C. worldhello 0
D. Segmentation fault/code crash
Answer» B. helloworld anyvalue
Discussion
80.

What is the output of this C code? #include int main() { char *str = "hello, world\n"; printf("%d", strlen(str)); }

A. Compilation error
B. Undefined behaviour
C. 13
D. 11
Answer» D. 11
Discussion
81.

What is the output of this C code? #include #include int main() { char *str = "hello, world"; char str1[9]; strncpy(str1, str, 9); printf("%s %d", str1, strlen(str1)); }

A. hello, world 11
B. hello, wor 9
C. Undefined behaviour
D. Compilation error
Answer» D. Compilation error
Discussion
82.

What is the output of this C code? #include int main() { char *str = "hello"; char str1[5]; strcpy(str, str1); printf("%s", str1); }

A. Compilation error
B. Undefined behaviour
C. hello, world
D. hello, wo 9
Answer» E.
Discussion
83.

What is the output of this C code? #include int main() { char *str = "hello, world"; char *str1 = "hello, world"; if (strcmp(str, str1)) printf("equal"); else printf("unequal"); }

A. equal
B. unequal
C. Compilation error
D. Depends on the compiler
Answer» C. Compilation error
Discussion
84.

What is the output of this C code? #include const int a = 1, b = 2; int main() { int x = 1; switch (x) { case a: printf("yes "); case b: printf("no\n"); break; } }

A. yes no
B. yes
C. no
D. Compile time error
Answer» E.
Discussion
85.

Switch statement accepts.

A. int
B. char
C. long
D. all of the mentioned
Answer» E.
Discussion
86.

What is the output of this C code? #include int main() { switch (printf("Do")) { case 1: printf("First\n"); break; case 2: printf("Second\n"); break; default: printf("Default\n"); break; } }

A. Do
B. DoFirst
C. DoSecond
D. DoDefault
Answer» D. DoDefault
Discussion
87.

What is the output of this C code? #include #define max(a) a int main() { int x = 1; switch (x) { case max(2): printf("yes "); case max(1): printf("no "); break; } }

A. yes no
B. yes
C. no
D. Compile time error
Answer» D. Compile time error
Discussion
88.

What is the output of this C code? #include int main() { float f = 1; switch (f) { case 1.0: printf("yes\n"); break; default: printf("default\n"); } }

A. yes
B. yes default
C. Undefined behaviour
D. Compile time error
Answer» E.
Discussion
89.

What is the output of this C code? #include int main() { int x = 97; switch (x) { case 'a': printf("yes "); break; case 97: printf("no\n"); break; } }

A. yes
B. yes no
C. Duplicate case value error
D. Character case value error
Answer» D. Character case value error
Discussion
90.

What is the output of this C code? #include int main() { int a = 1, b = 1; switch (a) { case a*b: printf("yes "); case a-b: printf("no\n"); break; } }

A. yes
B. no
C. Compile time error
D. yes no
Answer» D. yes no
Discussion
91.

What is the output of this C code(When 1 is entered)? #include void main() { int ch; printf("enter a value btw 1 to 2:"); scanf("%d", &ch); switch (ch, ch + 1) { case 1: printf("1\n"); break; case 2: printf("2"); break; } }

A. 1
B. 2
C. 3
D. Run time error
Answer» C. 3
Discussion
92.

What is the output of this C code(When 1 is entered)? #include void main() { char *ch; printf("enter a value btw 1 to 3:"); scanf("%s", ch); switch (ch) { case "1": printf("1"); break; case "2": printf("2"); break; } }

A. 1
B. Compile time error
C. 2
D. Run time error
Answer» C. 2
Discussion
93.

What is the output of this C code? #include int main() { int x = 1, y = 0; x &&= y; printf("%d\n", x); }

A. Compile time error
B. 1
C. 0
D. Undefined behaviour
Answer» B. 1
Discussion
94.

What is the output of this C code(When 2 is entered)? #include void main() { int ch; printf("enter a value btw 1 to 2:"); scanf("%d", &ch); switch (ch) { case 1: printf("1\n"); break; printf("hi"); default: printf("2\n"); } }

A. 1
B. hi 2
C. Run time error
D. 2
Answer» E.
Discussion
95.

What is the output of this C code(when 1 is entered)? #include void main() { double ch; printf("enter a value btw 1 to 2:"); scanf("%lf", &ch); switch (ch) { case 1: printf("1"); break; case 2: printf("2"); break; } }

A. Compile time error
B. 1
C. 2
D. Varies
Answer» B. 1
Discussion
96.

What is the output of this C code? #include int main() { int x = 2, y = 2; x /= x / y; printf("%d\n", x); return 0; }

A. 2
B. 1
C. 0.5
D. Undefined behaviour
Answer» B. 1
Discussion
97.

What is the output of this C code(When 1 is entered)? #include void main() { int ch; printf("enter a value btw 1 to 2:"); scanf("%d", &ch); switch (ch) { case 1: printf("1\n"); default: printf("2\n"); } }

A. 1
B. 2
C. 1 2
D. Run time error
Answer» D. Run time error
Discussion
98.

What is the output of this C code? #include int main() { int x = 2, y = 1; x *= x + y; printf("%d\n", x); return 0; }

A. 5
B. 6
C. Undefined behaviour
D. Compile time error
Answer» C. Undefined behaviour
Discussion
99.

What is the output of this C code? #include void main() { unsigned int x = -5; printf("%d", x); }

A. Run time error
B. Aries
C. -5
D. 5
Answer» D. 5
Discussion
100.

What is the output of this C code? #include void main() { 1 < 2 ? return 1: return 2; }

A. returns 1
B. returns 2
C. Varies
D. Compile time error
Answer» E.
Discussion