Pointers Questions and Answers

Pointers questions with answers are a crucial part of C programming preparation, often included in technical interviews and MCQ-based exams. Pointers are variables that store the memory address of other variables, making them fundamental to dynamic memory management and efficient program design. These C programming MCQ questions and answers help students understand pointer arithmetic, function pointers, arrays, and memory allocation. Commonly asked in placement exams by TCS, Infosys, and Wipro, mastering pointer concepts gives you a competitive edge in coding tests and programming interviews.

Pointers

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101. int *const size = 10; If the address of size is 3024, then size ++ is

11
3025
3026
invalid

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102. int ptr = (int ) malloc (sizeof (int)); ptr +=3; If ptr points tot the memory location 1000 and after execution of the statement ptr+=3, ptr with point to the memory location ________ (Assume 32 bits for int).

1006
1003
1010
none

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103. The amount of memory to be allocated for the following array of pointers. short *p[4];

no memory
4 bytes
6 bytes
16 bytes

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104. int x = 1; int ptr = malloc (sizeof (int)); ptr = &x; x=2; ptr=3; Is there anything wrong with the above code ?

No, x will be set to 2.
No, x will be set to 3.
Yes, there will be a memory overwrite.
yes, there will be a memory lead.

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105. int x = 1; int ptr = malloc (sizeof (int)); ptr = &x; x = 2; ptr = 3; Is there anything wrong with the above code ?

No, x will be set to 2.
No, x will be set to 3.
Yes, there will be a memory overwrite.
Yes, There will be a memory leak.

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106. int ptr = malloc (5 size of (int)); realloc (ptr, 10*size of (int)); for (i=0; i <10; i++) { ptr [i] = 0;} Assuming realloc succeeds, what effect will the above sample have on the rest of the program ?

The pointer "ptr" will contain an array of 10 that is initialized to 0 with no issues.
This will result in a memory overwrite but no memory leak.
This will result in a memory leak but no memory overwrite
This will result in both a memory leak and memory overwrite.

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107. int array [3]; int (ptr) [ ] = array; int x = 2, y = 3, z = 4; Referring to the sample code above, how would you assign the second pointer in the array 'ptr' to point to the value of y?

(*ptr) [1] = y;
(*ptr) [2] = &y;
*ptr [2] = y;
(*ptr) [1] =&y;

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108. void *ptr; What would be the correct way to cast ptr in the code above to be a pointer to a 3 element array of function pointers with a return value of int and a single parameter of a pointer to char ?

(int ((*)[3] (char*)ptr
((int*) (*[3] (char))ptr
(int (*(*)[3])(char*)ptr
(int *(*)[3](char *))ptr

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109. 100 main ( ) { int count = 0; int matrix [5 ] [5]; register int *ptr; int i, j; for (i=0, i<5;i++) for (j=0; j<5; j++) matrix [i] [j] = count ++; ptr = &matrix [1] [1]; printf ("%d\n", ptr [2]); } Referring to the sample above, what will be the value of "ptr[2]", after execution?

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110. main ( ) { int a[4] [2]; int b = 0, x; _ int i, y; for (i=0; i<4; i++) for (y=0; y<2;y++) a [i] [y] =b++; x = * (*(a+2) - 1); } What is the value of x in the above sample ?

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Pointers Questions and Answers

Pointers

101. int *const size = 10; If the address of size is 3024, then size ++ is

102. int *ptr = (int *) malloc (sizeof (int)); ptr +=3; If ptr points tot the memory location 1000 and after execution of the statement ptr+=3, ptr with point to the memory location ________ (Assume 32 bits for int).

103. The amount of memory to be allocated for the following array of pointers. short *p[4];

104. int x = 1; int *ptr = malloc (sizeof (int)); ptr = &amp;x; x=2; *ptr=3; Is there anything wrong with the above code ?

105. int x = 1; int *ptr = malloc (sizeof (int)); ptr = &amp;x; x = 2; *ptr = 3; Is there anything wrong with the above code ?

106. int *ptr = malloc (5 * size of (int)); realloc (ptr, 10*size of (int)); for (i=0; i &lt;10; i++) { ptr [i] = 0;} Assuming realloc succeeds, what effect will the above sample have on the rest of the program ?

107. int *array [3]; int (*ptr) [ ] = array; int x = 2, y = 3, z = 4; Referring to the sample code above, how would you assign the second pointer in the array 'ptr' to point to the value of y?

108. void *ptr; What would be the correct way to cast ptr in the code above to be a pointer to a 3 element array of function pointers with a return value of int and a single parameter of a pointer to char ?

110. main ( ) { int a[4] [2]; int b = 0, x; _ int i, y; for (i=0; i&lt;4; i++) for (y=0; y&lt;2;y++) a [i] [y] =b++; x = * (*(a+2) - 1); } What is the value of x in the above sample ?

C Language

102. int ptr = (int ) malloc (sizeof (int)); ptr +=3; If ptr points tot the memory location 1000 and after execution of the statement ptr+=3, ptr with point to the memory location ________ (Assume 32 bits for int).

104. int x = 1; int ptr = malloc (sizeof (int)); ptr = &x; x=2; ptr=3; Is there anything wrong with the above code ?

105. int x = 1; int ptr = malloc (sizeof (int)); ptr = &x; x = 2; ptr = 3; Is there anything wrong with the above code ?

106. int ptr = malloc (5 size of (int)); realloc (ptr, 10*size of (int)); for (i=0; i <10; i++) { ptr [i] = 0;} Assuming realloc succeeds, what effect will the above sample have on the rest of the program ?

107. int array [3]; int (ptr) [ ] = array; int x = 2, y = 3, z = 4; Referring to the sample code above, how would you assign the second pointer in the array 'ptr' to point to the value of y?

110. main ( ) { int a[4] [2]; int b = 0, x; _ int i, y; for (i=0; i<4; i++) for (y=0; y<2;y++) a [i] [y] =b++; x = * (*(a+2) - 1); } What is the value of x in the above sample ?