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.

Every C program will contain at least one preprocessor directive.

A. True
B. False
Answer» C.
Discussion
2.

Preprocessor directive #ifdef .. #else ... #endif is used for conditional compilation.

A. True
B. False
Answer» B. False
Discussion
3.

What will be the output of the program (sample.c) given below if it is executed from the command line? cmd> sample Jan Feb Mar /* sample.c */ #include<stdio.h> #include<dos.h> int main(int arc, char *arv[]) { int i; for(i=1; i<_argc; i++) printf("%s ", _argv[i]); return 0; }

A. No output
B. sample Jan Feb Mar
C. Jan Feb Mar
D. Error
Answer» D. Error
Discussion
4.

Macros with arguments are allowed

A. True
B. False
Answer» B. False
Discussion
5.

Which of the following statements correctly assigns 12 to month using pointer variable pdt? #include<stdio.h> struct date { int day; int month; int year; }; int main() { struct date d; struct date *pdt; pdt = &d; return 0; }

A. pdt.month = 12
B. &pdt.month = 12
C. d.month = 12
D. pdt->month = 12
Answer» E.
Discussion
6.

A union cannot be nested in a structure

A. True
B. False
Answer» C.
Discussion
7.

Bit fields CANNOT be used in union.

A. True
B. False
Answer» C.
Discussion
8.

one of elements of a structure can be a pointer to the same structure.

A. True
B. False
Answer» B. False
Discussion
9.

A structure can be nested inside another structure.

A. True
B. False
Answer» B. False
Discussion
10.

Point out the error in the program? typedef struct data mystruct; struct data { int x; mystruct *b; };

A. Error: in structure declaration
B. Linker Error
C. No Error
D. None of above
Answer» D. None of above
Discussion
11.

Point out the error in the program? #include<stdio.h> int main() { struct emp { char name[20]; float sal; }; struct emp e[10]; int i; for(i=0; i<=9; i++) scanf("%s %f", e[i].name, &e[i].sal); return 0; }

A. Error: invalid structure member
B. Error: Floating point formats not linked
C. No error
D. None of above
Answer» C. No error
Discussion
12.

What will be the output of the program ? #include<stdio.h> int main() { union a { int i; char ch[2]; }; union a u; u.ch[0]=3; u.ch[1]=2; printf("%d, %d, %d n", u.ch[0], u.ch[1], u.i); return 0; }

A. 3, 2, 515
B. 515, 2, 3
C. 3, 2, 5
D. 515, 515, 4
Answer» B. 515, 2, 3
Discussion
13.

What will be the output of the program ? #include<stdio.h> int main() { struct value { int bit1:1; int bit3:4; int bit4:4; }bit={1, 2, 13}; printf("%d, %d, %d n", bit.bit1, bit.bit3, bit.bit4); return 0; }

A. 1, 2, 13
B. 1, 4, 4
C. -1, 2, -3
D. -1, -2, -13
Answer» D. -1, -2, -13
Discussion
14.

What will be the output of the program ? #include<stdio.h> int main() { enum days {MON=-1, TUE, WED=6, THU, FRI, SAT}; printf("%d, %d, %d, %d, %d, %d n", MON, TUE, WED, THU, FRI, SAT); return 0; }

A. -1, 0, 1, 2, 3, 4
B. -1, 2, 6, 3, 4, 5
C. -1, 0, 6, 2, 3, 4
D. -1, 0, 6, 7, 8, 9
Answer» E.
Discussion
15.

What will be the output of the program in 16 bit platform (Turbo C under DOS) ? #include<stdio.h> int main() { struct value { int bit1:1; int bit3:4; int bit4:4; }bit; printf("%d n", sizeof(bit)); return 0; }

A. 1
B. 2
C. 4
D. 9
Answer» C. 4
Discussion
16.

What will be the output of the program (myprog.c) given below if it is executed from the command line? cmd> myprog one two three /* myprog.c */ #include<stdio.h> int main(int argc, char **argv) { printf("%c n", **++argv); return 0; }

A. myprog one two three
B. myprog one
C. o
D. two
Answer» D. two
Discussion
17.

What will be the output of the program (myprog.c) given below if it is executed from the command line? cmd> myprog one two three /* myprog.c */ #include<stdio.h> #include<stdlib.h> int main(int argc, char **argv) { printf("%s n", *++argv); return 0; }

A. myprog
B. one
C. two
D. three
Answer» C. two
Discussion
18.

What will be the output of the program (sample.c) given below if it is executed from the command line (turbo c under DOS)? cmd> sample Good Morning /* sample.c */ #include<stdio.h> int main(int argc, char *argv[]) { printf("%d %s", argc, argv[1]); return 0; }

A. 3 Good
B. 2 Good
C. Good Morning
D. 3 Morning
Answer» B. 2 Good
Discussion
19.

What will be the output of the program #include<stdio.h> void fun(int); int main(int argc) { printf("%d ", argc); fun(argc); return 0; } void fun(int i) { if(i!=4) main(++i); }

A. 1 2 3
B. 1 2 3 4
C. 2 3 4
D. 1
Answer» C. 2 3 4
Discussion
20.

What will be the output of the program ? #include<stdio.h> #include<string.h> int main() { int i, n; char *x="Alice"; n = strlen(x); *x = x[n]; for(i=0; i<=n; i++) { printf("%s ", x); x++; } printf(" n", x); return 0; }

A. Alice
B. ecilA
C. Alice lice ice ce e
D. lice ice ce e
Answer» E.
Discussion
21.

Macro calls and function calls work exactly similarly.

A. True
B. False
Answer» C.
Discussion
22.

Every time we supply new set of values to the program at command prompt, we need to recompile the program.

A. True
B. False
Answer» C.
Discussion
23.

If the size of integer is 4bytes, What will be the output of the program? #include<stdio.h> int main() { int arr[] = {12, 13, 14, 15, 16}; printf("%d, %d, %d n", sizeof(arr), sizeof(*arr), sizeof(arr[0])); return 0; }

A. 10, 2, 4
B. 20, 4, 4
C. 16, 2, 2
D. 20, 2, 2
Answer» C. 16, 2, 2
Discussion
24.

What will be the output of the program? #include<stdio.h> #define SWAP(a, b) int t; t=a, a=b, b=t; int main() { int a=10, b=12; SWAP(a, b); printf("a = %d, b = %d n", a, b); return 0; }

A. a = 10, b = 12
B. a = 12, b = 10
C. Error: Declaration not allowed in macro
D. Error: Undefined symbol 't'
Answer» C. Error: Declaration not allowed in macro
Discussion
25.

What will be the output of the program? #include<stdio.h> #define PRINT(int) printf("int=%d, ", int); int main() { int x=2, y=3, z=4; PRINT(x); PRINT(y); PRINT(z); return 0; }

A. int=2, int=3, int=4
B. int=2, int=2, int=2
C. int=3, int=3, int=3
D. int=4, int=4, int=4
Answer» B. int=2, int=2, int=2
Discussion
26.

What will be the output of the program? #include<stdio.h> #define FUN(i, j) i##j int main() { int va1=10; int va12=20; printf("%d n", FUN(va1, 2)); return 0; }

A. 10
B. 20
C. 1020
D. 12
Answer» C. 1020
Discussion
27.

What will be the output of the program? #include<stdio.h> #define MAX(a, b) (a > b ? a : b) int main() { int x; x = MAX(3+2, 2+7); printf("%d n", x); return 0; }

A. 8
B. 9
C. 6
D. 5
Answer» C. 6
Discussion
28.

What will be the output of the program ? #include<stdio.h> int main() { char str1[] = "India"; char str2[] = "BIX"; char *s1 = str1, *s2=str2; while(*s1++ = *s2++) printf("%s", str1); printf(" n"); return 0; }

A. IndiaBIX
B. BndiaBIdiaBIXia
C. India
D. (null)
Answer» C. India
Discussion
29.

What will be the output of the program assuming that the array begins at location 1002? #include<stdio.h> int main() { int a[2][3][4] = { {1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 1, 2}, {2, 1, 4, 7, 6, 7, 8, 9, 0, 0, 0, 0} }; printf("%u, %u, %u, %d n", a, *a, **a, ***a); return 0; }

A. 1002, 2004, 4008, 2
B. 2004, 4008, 8016, 1
C. 1002, 1002, 1002, 1
D. Error
Answer» D. Error
Discussion
30.

What will be the output of the program ? #include<stdio.h> int main() { char str[] = "peace"; char *s = str; printf("%s n", s++ +3); return 0; }

A. peace
B. eace
C. ace
D. ce
Answer» E.
Discussion
31.

What will be the output of the program ? #include<stdio.h> power(int**); int main() { int a=5, *aa; /* Address of 'a' is 1000 */ aa = &a; a = power(&aa); printf("%d n", a); return 0; } power(int **ptr) { int b; b = **ptr***ptr; return (b); }

A. 5
B. 25
C. 125
D. Garbage value
Answer» C. 125
Discussion
32.

What will be the output of the program ? #include<stdio.h> int main() { printf("%c n", 7["IndiaBIX"]); return 0; }

A. Error: in printf
B. Nothing will print
C. print "X" of IndiaBIX
D. print "7"
Answer» D. print "7"
Discussion
33.

What will be the output of the program ? #include<stdio.h> int *check(static int, static int); int main() { int *c; c = check(10, 20); printf("%d n", c); return 0; } int *check(static int i, static int j) { int *p, *q; p = &i; q = &j; if(i >= 45) return (p); else return (q); }

A. 10
B. 20
C. Error: Non portable pointer conversion
D. Error: cannot use static for function parameters
Answer» E.
Discussion
34.

What will be the output of the program ? #include<stdio.h> int main() { char *str; str = "%s"; printf(str, "K n"); return 0; }

A. Error
B. No output
C. K
D. %s
Answer» D. %s
Discussion
35.

Will the following program print the message infinite number of times? #include<stdio.h> #define INFINITELOOP while(1) int main() { INFINITELOOP printf("IndiaBIX"); return 0; }

A. Yes
B. No
Answer» B. No
Discussion
36.

Will it result in to an error if a header file is included twice?

A. Yes
B. No
C. It is compiler dependent.
Answer» D.
Discussion
37.

What will be the output of the program? #include<stdio.h> int main() { int arr[3] = {2, 3, 4}; char *p; p = arr; p = (char*)((int*)(p)); printf("%d, ", *p); p = (int*)(p+1); printf("%d", *p); return 0; }

A. 2, 3
B. 2, 0
C. 2, Garbage value
D. 0, 0
Answer» C. 2, Garbage value
Discussion
38.

What will be the output of the program if the size of pointer is 4-bytes? #include<stdio.h> int main() { printf("%d, %d n", sizeof(NULL), sizeof("")); return 0; }

A. 2, 1
B. 2, 2
C. 4, 1
D. 4, 2
Answer» D. 4, 2
Discussion
39.

What will be the output of the program ? #include<stdio.h> int main() { char *p; p="hello"; printf("%s n", *&amp*&p); return 0; }

A. llo
B. hello
C. ello
D. h
Answer» C. ello
Discussion
40.

What will be the output of the program? #include<stdio.h> int main() { int arr[2][2][2] = {10, 2, 3, 4, 5, 6, 7, 8}; int *p, *q; p = &arr[1][1][1]; q = (int*) arr; printf("%d, %d n", *p, *q); return 0; }

A. 8, 10
B. 10, 2
C. 8, 1
D. Garbage values
Answer» B. 10, 2
Discussion
41.

What will be the output of the program assuming that the array begins at the location 1002 and size of an integer is 4 bytes? #include<stdio.h> int main() { int a[3][4] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }; printf("%u, %u, %u n", a[0]+1, *(a[0]+1), *(*(a+0)+1)); return 0; }

A. 448, 4, 4
B. 520, 2, 2
C. 1006, 2, 2
D. Error
Answer» D. Error
Discussion
42.

Even if integer/float arguments are supplied at command prompt they are treated as strings.

A. True
B. False
Answer» B. False
Discussion
43.

The first argument to be supplied at command-line must always be count of total arguments.

A. True
B. False
Answer» C.
Discussion
44.

Which of the following is TRUE about argv?

A. It is an array of character pointers
B. It is a pointer to an array of character pointers
C. It is an array of strings
D. None of above
Answer» B. It is a pointer to an array of character pointers
Discussion
45.

What will be the output of the program? #include<stdio.h> #define CUBE(x) (x*x*x) int main() { int a, b=3; a = CUBE(b++); printf("%d, %d n", a, b); return 0; }

A. 9, 4
B. 27, 4
C. 27, 6
D. Error
Answer» D. Error
Discussion
46.

Point out the error in the program #include<stdio.h> #define SI(p, n, r) float si; si=p*n*r/100; int main() { float p=2500, r=3.5; int n=3; SI(p, n, r); SI(1500, 2, 2.5); return 0; }

A. 26250.00 7500.00
B. Nothing will print
C. Error: Multiple declaration of
D. <i class="C-code">si</i>
E. Garbage values
Answer» D. <i class="C-code">si</i>
Discussion
47.

What will be the output of the program? #include&lt;stdio.h&gt; #define MAN(x, y) ((x)&gt;(y)) ? (x):(y); int main() { int i=10, j=5, k=0; k = MAN(++i, j++); printf("%d, %d, %d n", i, j, k); return 0; }

A. 12, 6, 12
B. 11, 5, 11
C. 11, 5, Garbage
D. 12, 6, Garbage
Answer» B. 11, 5, 11
Discussion
48.

What will be the output of the program? #include&lt;stdio.h&gt; #define SQR(x)(x*x) int main() { int a, b=3; a = SQR(b+2); printf("%d n", a); return 0; }

A. 25
B. 11
C. Error
D. Garbage value
Answer» C. Error
Discussion
49.

What will be the output of the program? #include&lt;stdio.h&gt; #define JOIN(s1, s2) printf("%s=%s %s=%s n", #s1, s1, #s2, s2); int main() { char *str1="India"; char *str2="BIX"; JOIN(str1, str2); return 0; }

A. str1=IndiaBIX str2=BIX
B. str1=India str2=BIX
C. str1=India str2=IndiaBIX
D. Error: in macro substitution
Answer» C. str1=India str2=IndiaBIX
Discussion
50.

A text stream is an ordered sequence of characters composed into lines, each line consisting of zero or more characters plus a terminating new-line character.

A. True
B. False
Answer» B. False
Discussion