Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

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
2.

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
3.

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
4.

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
5.

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
6.

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
7.

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
8.

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
9.

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
10.

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
11.

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
12.

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
13.

What is the output of this C code? #include

A. Nothing
B. Compile time error
C. Junk
D. 8
Answer» E.
Discussion
14.

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
15.

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
16.

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
17.

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
18.

Which operator connects the structure name to its member name?

A. –
B. <-
C. .
D. Both <- and .
Answer» D. Both <- and .
Discussion
19.

User-defined data type can be derived by___________

A. struct
B. enum
C. typedef
D. all of the mentioned
Answer» E.
Discussion
20.

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
21.

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
22.

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
23.

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
24.

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
25.

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
26.

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
27.

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
28.

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
29.

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
30.

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
31.

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
32.

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
33.

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
34.

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
35.

Switch statement accepts.

A. int
B. char
C. long
D. all of the mentioned
Answer» E.
Discussion
36.

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
37.

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
38.

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
39.

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
40.

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
41.

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
42.

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
43.

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
44.

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
45.

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
46.

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
47.

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
48.

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
49.

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
50.

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