Explore topic-wise MCQs in Pointers.

This section includes 79 Mcqs, each offering curated multiple-choice questions to sharpen your Pointers knowledge and support exam preparation. Choose a topic below to get started.

1.

What will be the output of the program ? #include 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
2.

Which of the following changes can correct the program so that it prints Geeks Quiz ? #include void myStrcat(char *a, char *b) { int m = strlen(a); int n = strlen(b); int i; for (i = 0; i <= n; i++) a[m+i] = b[i]; } int main() { char *str1 = "Geeks "; char *str2 = "Quiz"; myStrcat(str1, str2); printf("%s ", str1); return 0; }

A. char *str1 = Geeks ; can be changed to char str1[100] = Geeks ;
B. char *str1 = Geeks ; can be changed to char str1[100] = Geeks ; and a line a[m+n-1] = 0 is added at the end of myStrcat
C. A line a[m+n-1] = 0 is added at the end of myStrcat
D. A line a = (char *)malloc(sizeof(char)*(strlen(a) + strlen(b) + 1)) is added at the beginning of myStrcat()
Answer» B. char *str1 = Geeks ; can be changed to char str1[100] = Geeks ; and a line a[m+n-1] = 0 is added at the end of myStrcat
Discussion
3.

Which of the following declaration throw run-time error?

A. int **c = &c;
B. int **c = &*c;
C. int **c = **c;
D. None of the mentioned
Answer» E.
Discussion
4.

Comment on the output of this C code? int main() { int a = 10; int **c -= &&a; }

A. You cannot apply any arithmetic operand to a pointer.
B. We don t have address of an address operator
C. Both (a) and (b)
D. None of the mentioned.
Answer» C. Both (a) and (b)
Discussion
5.

What substitution should be made to //-Ref such that ptr1 points to variable C? int main() { int a = 1, b = 2, c = 3; int *ptr1 = &a; int **sptr = &ptr1; //-Ref }

A. *sptr = &c;
B. **sptr = &c;
C. *ptr1 = &c;
D. None of the mentioned.
Answer» B. **sptr = &c;
Discussion
6.

What is the output of this C code? int main() { int a = 1, b = 2, c = 3; int *ptr1 = &a, *ptr2 = &b, *ptr3 = &c; int **sptr = &ptr1; //-Ref *sptr = ptr2; }

A. ptr1 points to a
B. ptr1 points to b
C. sptr points to ptr2
D. None of the mentioned
Answer» C. sptr points to ptr2
Discussion
7.

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 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
8.

What will be the output of the program ? #include int main() { int i=3, *j, k; j = &i; printf("%d n", i**j*i+*j); return 0; }

A. 30
B. 37
C. 7
D. 9
Answer» B. 37
Discussion
9.

What will be the output of the program ? #include int main() { static char *s[] = {"black", "white", "pink", "violet"}; char **ptr[] = {s+3, s+2, s+1, s}, ***p; p = ptr; ++p; printf("%s", **p+1); return 0; }

A. ink
B. ack
C. ite
D. let
Answer» B. ack
Discussion
10.

What will be the output of the program? #include 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
11.

What will be the output of the program ? #include int main() { void *vp; char ch=74, *cp="JACK"; int j=65; vp=&ch; printf("%c", *(char*)vp); vp=&j; printf("%c", *(int*)vp); vp=cp; printf("%s", (char*)vp+2); return 0; }

A. JCK
B. J65K
C. JAK
D. JACK
Answer» E.
Discussion
12.

What will be the output of the program if the size of pointer is 4-bytes? #include 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
13.

What will be the output of the program ? #include 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
14.

What would be the equivalent pointer expression for referring the array element a[i][j][k][l]

A. ((((a+i)+j)+k)+l)
B. *(*(*(*(a+i)+j)+k)+l)
C. (((a+i)+j)+k+l)
D. ((a+i)+j+k+l)
Answer» C. (((a+i)+j)+k+l)
Discussion
15.

How many bytes are occupied by near, far and huge pointers (DOS)?

A. near=2 far=4 huge=4
B. near=4 far=8 huge=8
C. near=2 far=4 huge=8
D. near=4 far=4 huge=8
Answer» B. near=4 far=8 huge=8
Discussion
16.

What will be the output of the program ? #include int main() { char str[20] = "Hello"; char *const p=str; *p='M'; printf("%s n", str); return 0; }

A. Mello
B. Hello
C. HMello
D. MHello
Answer» B. Hello
Discussion
17.

Can you combine the following two statements into one? char *p; p = (char*) malloc(100);

A. char p = *malloc(100);
B. char *p = (char) malloc(100);
C. char *p = (char*)malloc(100);
D. char *p = (char *)(malloc*)(100);
Answer» D. char *p = (char *)(malloc*)(100);
Discussion
18.

What will be the output of the program ? #include int main() { int x=30, *y, *z; y=&x; /* Assume address of x is 500 and integer is 4 byte size */ z=y; *y++=*z++; x++; printf("x=%d, y=%d, z=%d n", x, y, z); return 0; }

A. x=31, y=502, z=502
B. x=31, y=500, z=500
C. x=31, y=498, z=498
D. x=31, y=504, z=504
Answer» E.
Discussion
19.

What will be the output of the program If the integer is 4bytes long? #include int main() { int ***r, **q, *p, i=8; p = &i; q = &p; r = &q; printf("%d, %d, %d n", *p, **q, ***r); return 0; }

A. 8, 8, 8
B. 4000, 4002, 4004
C. 4000, 4004, 4008
D. 4000, 4008, 4016
Answer» B. 4000, 4002, 4004
Discussion
20.

What will be the output of the program ? #include void fun(void *p); int i; int main() { void *vptr; vptr = &i; fun(vptr); return 0; } void fun(void *p) { int **q; q = (int**)&p; printf("%d n", **q); }

A. Error: cannot convert from void** to int**
B. Garbage value
C. No output
Answer» A. Error: cannot convert from void** to int**
Discussion
21.

How many number of pointer (*) does C have against a pointer variable declaration?

A. 7
B. 127
C. 255
D. No limits
Answer» E.
Discussion
22.

Which of the following is the correct syntax to send an array as a parameter to function?

A. func(&array);
B. func(#array);
C. func(*array);
D. func(array[size]);
Answer» B. func(#array);
Discussion
23.

What will be the output of the following C code? #include int main() { int i = 10; int *p = &i; foo(&p); printf("%d ", *p); printf("%d ", *p); } void foo(int **const p) { int j = 11; *p = &j; printf("%d ", **p); }

A. 11 11 11
B. 11 11 Undefined-value
C. Compile time error
D. Segmentation fault/code-crash
Answer» C. Compile time error
Discussion
24.

What will be the output of the following C code? #include int main() { int i = 10; int *const p = &i; foo(&p); printf("%d n", *p); } void foo(int **p) { int j = 11; *p = &j; printf("%d n", **p); }

A. 11 11
B. Undefined behaviour
C. Compile time error
D. Segmentation fault/code-crash
Answer» B. Undefined behaviour
Discussion
25.

What will be the output of the following C code? #include int main() { int i = 11; int *p = &i; foo(&p); printf("%d ", *p); } void foo(int *const *p) { int j = 10; *p = &j; printf("%d ", **p); }

A. Compile time error
B. 10 10
C. Undefined behaviour
D. 10 11
Answer» B. 10 10
Discussion
26.

What will be the output of the following C code? #include int main() { int i = 97, *p = &i; foo(&p); printf("%d ", *p); return 0; } void foo(int **p) { int j = 2; *p = &j; printf("%d ", **p); }

A. 2 2
B. 2 97
C. Undefined behaviour
D. Segmentation fault/code crash
Answer» B. 2 97
Discussion
27.

What will be the output of the following C code? #include int main() { int i = 97, *p = &i; foo(&i); printf("%d ", *p); } void foo(int *p) { int j = 2; p = &j; printf("%d ", *p); }

A. 2 97
B. 2 2
C. Compile time error
D. Segmentation fault/code crash
Answer» B. 2 2
Discussion
28.

What will be the output of the following C code? #include void foo(int*); int main() { int i = 10, *p = &i; foo(p++); } void foo(int *p) { printf("%d n", *p); }

A. 10
B. Some garbage value
C. Compile time error
D. Segmentation fault
Answer» B. Some garbage value
Discussion
29.

What is the output of this C code? void foo(int*); int main() { int i = 10; foo((&i)++); } void foo(int *p) { printf("%d n", *p); }

A. 10
B. Some garbage value
C. Compile time error
D. Segmentation fault/code crash
Answer» D. Segmentation fault/code crash
Discussion
30.

What will be the output of the following C code? #include void foo(int*); int main() { int i = 10; foo((&i)++); } void foo(int *p) { printf("%d n", *p); }

A. 10
B. Some garbage value
C. Compile time error
D. Segmentation fault/code crash
Answer» D. Segmentation fault/code crash
Discussion
31.

What is the output of this C code? void main() { int x = 0; int *ptr = &x; printf("%d n", *ptr); }

A. Address of x
B. Junk value
C. Run time error
Answer» A. Address of x
Discussion
32.

What is the output of this C code? void main() { int x = 0; int *ptr = &5; printf("%p n", ptr); }

A. 5
B. Address of 5
C. Nothing
D. Compile time error
Answer» E.
Discussion
33.

What will be the output of the program ? #include #include 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
34.

If the size of integer is 4bytes, What will be the output of the program? #include 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
35.

What is the output of this C code? void main() { int x = 0; int *ptr = &x; printf("%p n", ptr); ptr++; printf("%p n ", ptr); }

A. 0xbfd605e8 0xbfd605ec
B. 0xbfd605e8 0cbfd60520
C. 0xbfd605e8 0xbfd605e9
D. Run time error
Answer» B. 0xbfd605e8 0cbfd60520
Discussion
36.

What is the output of this C code? int x = 0; void main() { int *const ptr = &x; printf("%p n", ptr); ptr++; printf("%p n ", ptr); }

A. 0 1
B. Compile time error
C. 0xbfd605e8 0xbfd605ec
D. 0xbfd605e8 0xbfd605e8
Answer» C. 0xbfd605e8 0xbfd605ec
Discussion
37.

What will be the output of the program ? #include 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.
D. D.
Answer» C.
Discussion
38.

What will be the output of the program ? #include 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
39.

What will be the output of the program assuming that the array begins at location 1002? #include 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
40.

What will be the output of the program ? #include 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
41.

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

A. llo
B. hello
C. ello
D. h
Answer» C. ello
Discussion
42.

What will be the output of the program ? #include int main() { char *str; str = "%d n"; str++; str++; printf(str-2, 300); return 0; }

A. No output
B. 30
C. 3
D. 300
Answer» E.
Discussion
43.

What will be the output of the program ? #include 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
44.

What will be the output of the program? #include 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
45.

What is the output of this C code? int x = 0; void main() { int *ptr = &x; printf("%p n", ptr); x++; printf("%p n ", ptr); }

A. Same address
B. Different address
C. Compile time error
D. Varies
Answer» B. Different address
Discussion
46.

Are the three declarations char **apple, char *apple[ ], and char apple[ ][ ] same?

A. True
B. False
Answer» C.
Discussion
47.

What is the output of this C code? int *f(); int main() { int *p = f(); printf("%d n", *p); } int *f() { int *j = (int*)malloc(sizeof(int)); *j = 10; return j; }

A. 10
B. Compile time error
C. Segmentation fault/runtime crash since pointer to local variable is returned
D. Undefined behaviour
Answer» B. Compile time error
Discussion
48.

What is the output of this C code? int *f(); int main() { int *p = f(); printf("%d n", *p); } int *f() { int j = 10; return &j; }

A. 10
B. Compile time error
C. Segmentation fault/runtime crash
D. Undefined behaviour
Answer» B. Compile time error
Discussion
49.

What is the output of this C code? int main() { int i = 10; void *p = &i; printf("%f n", *(float*)p); return 0; }

A. Compile time error
B. Undefined behaviour
C. 10
D. 0.000000
Answer» E.
Discussion
50.

What is the output of this C code? int main() { int i = 10; void *p = &i; printf("%d n", (int)*p); return 0; }

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