Pointer - C Programming MCQ Questions and Answers

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21.
What is the index of the last argument in command line arguments?

A. argc - 2

B. argc + 1

C. argc

D. argc - 1

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22.

What makes the following declaration denote?

int **ptr;

A. ptr is a function pointer that returns pointer to int type

B. ptr is a pointer to an int pointer

C. ptr is a pointer to pointer to type int

D. none of the mentioned

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23.

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    foo(ary);
}
void foo(int **ary)
{
    int i = 10, k = 20, j = 30;
    int *ary[2];
    ary[0] = &i;
    ary[1] = &j;
    printf("%d\n", ary[0][1]);
}

A. 10

B. 20

C. Compile time error

D. Undefined behaviour

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24.

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    char str[] = "hello, world";
    str[5] = '.';
    printf("%s\n", str);
    return 0;
}

A. hello. world

B. hello, world

C. Compile error

D. Segmentation fault

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25.

What will be the output of the following C code?

#include <stdio.h>
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

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26.
Which of the following arithmetic operation can be applied to pointers a and b?
(Assuming initialization as int a = (int )2; int b = (int )3;)

A. a + b

B. a - b

C. a * b

D. a / b

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27.

What will be the output of the following C code?

#include <stdio.h>
void main()
{
    char a[10][5] = {"hi", "hello", "fellows"};
    printf("%d", sizeof(a[1]));
}

A. 2

B. 4

C. 5

D. 10

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28.

Comment on the following two operations.

int *a[] = {{1, 2, 3}, {1, 2, 3, 4}}; //- 1
int b[4][4] = {{1, 2, 3}, {1, 2, 3, 4}};//- 2

A. 1 will work, 2 will not

B. 1 and 2, both will work

C. 1 won't work, 2 will work

D. Neither of them will work

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29.

Which function is not called in the following C program?

#include <stdio.h>
void first()
{
    printf("first");
}
void second()
{
    first();
}
void third()
{
    second();
}
void main()
{
    void (*ptr)();
    ptr = third;
    ptr();
}

A. Function first

B. Function second

C. Function third

D. None of the mentioned

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30.
Which of the following syntax is correct for command-line arguments?

A. int main(int var, char *varg[])

B. int main(char *argv[], int argc)

C. int main(){int argv, char *argc[];}

D. none of the mentioned

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21.
What is the index of the last argument in command line arguments?

Answer & Solution

22.
What makes the following declaration denote?

`int **ptr;`

Answer & Solution

23.
What will be the output of the following C code?

`#include <stdio.h> int main() { foo(ary); } void foo(int **ary) { int i = 10, k = 20, j = 30; int *ary[2]; ary[0] = &i; ary[1] = &j; printf("%d\n", ary[0][1]); }`

Answer & Solution

24.
What will be the output of the following C code?

`#include <stdio.h> int main() { char str[] = "hello, world"; str[5] = '.'; printf("%s\n", str); return 0; }`

Answer & Solution

25.
What will be the output of the following C code?

`#include <stdio.h> 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); }`

Answer & Solution

26.
Which of the following arithmetic operation can be applied to pointers a and b?
(Assuming initialization as int a = (int )2; int b = (int )3;)

Answer & Solution

27.
What will be the output of the following C code?

`#include <stdio.h> void main() { char a[10][5] = {"hi", "hello", "fellows"}; printf("%d", sizeof(a[1])); }`

Answer & Solution

28.
Comment on the following two operations.

`int *a[] = {{1, 2, 3}, {1, 2, 3, 4}}; //- 1 int b[4][4] = {{1, 2, 3}, {1, 2, 3, 4}};//- 2`

Answer & Solution

29.
Which function is not called in the following C program?

`#include <stdio.h> void first() { printf("first"); } void second() { first(); } void third() { second(); } void main() { void (*ptr)(); ptr = third; ptr(); }`

Answer & Solution

30.
Which of the following syntax is correct for command-line arguments?

Answer & Solution

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Pointer - C Programming MCQ Questions and Answers

21. What is the index of the last argument in command line arguments?

Answer & Solution

22. What makes the following declaration denote? int **ptr;

Answer & Solution

23. What will be the output of the following C code? #include <stdio.h> int main() { foo(ary); } void foo(int **ary) { int i = 10, k = 20, j = 30; int *ary[2]; ary[0] = &i; ary[1] = &j; printf("%d\n", ary[0][1]); }

Answer & Solution

24. What will be the output of the following C code? #include <stdio.h> int main() { char str[] = "hello, world"; str[5] = '.'; printf("%s\n", str); return 0; }

Answer & Solution

25. What will be the output of the following C code? #include <stdio.h> 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); }

Answer & Solution

26. Which of the following arithmetic operation can be applied to pointers a and b?(Assuming initialization as int *a = (int *)2; int *b = (int *)3;)

Answer & Solution

27. What will be the output of the following C code? #include <stdio.h> void main() { char a[10][5] = {"hi", "hello", "fellows"}; printf("%d", sizeof(a[1])); }

Answer & Solution

28. Comment on the following two operations. int *a[] = {{1, 2, 3}, {1, 2, 3, 4}}; //- 1 int b[4][4] = {{1, 2, 3}, {1, 2, 3, 4}};//- 2

Answer & Solution

29. Which function is not called in the following C program? #include <stdio.h> void first() { printf("first"); } void second() { first(); } void third() { second(); } void main() { void (*ptr)(); ptr = third; ptr(); }

Answer & Solution

30. Which of the following syntax is correct for command-line arguments?

Answer & Solution

Read More Section(Pointer)

21.
What is the index of the last argument in command line arguments?

22.
What makes the following declaration denote?

`int **ptr;`

23.
What will be the output of the following C code?

`#include <stdio.h> int main() { foo(ary); } void foo(int **ary) { int i = 10, k = 20, j = 30; int *ary[2]; ary[0] = &i; ary[1] = &j; printf("%d\n", ary[0][1]); }`

24.
What will be the output of the following C code?

`#include <stdio.h> int main() { char str[] = "hello, world"; str[5] = '.'; printf("%s\n", str); return 0; }`

25.
What will be the output of the following C code?

`#include <stdio.h> 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); }`

26.
Which of the following arithmetic operation can be applied to pointers a and b?
(Assuming initialization as int a = (int )2; int b = (int )3;)

27.
What will be the output of the following C code?

`#include <stdio.h> void main() { char a[10][5] = {"hi", "hello", "fellows"}; printf("%d", sizeof(a[1])); }`

28.
Comment on the following two operations.

`int *a[] = {{1, 2, 3}, {1, 2, 3, 4}}; //- 1 int b[4][4] = {{1, 2, 3}, {1, 2, 3, 4}};//- 2`

29.
Which function is not called in the following C program?

`#include <stdio.h> void first() { printf("first"); } void second() { first(); } void third() { second(); } void main() { void (*ptr)(); ptr = third; ptr(); }`

30.
Which of the following syntax is correct for command-line arguments?