C Programming Questions and Answers – Character Pointers and Functions

C Programming Questions and Answers – Character Pointers and Functions

1.What is the output of this C code?

#include <stdio.h>

int main()

{

char *str = “hello, world\n”;

char *strc = “good morning\n”;

strcpy(strc, str);

printf(“%s\n”, strc);

return 0;

}

a) hello, world

b) Crash/segmentation fault

c) Undefined behaviour

d) Run time error

2.What is the output of this C code?

#include <stdio.h>

int main()

{

char *str = “hello world”;

char strc[] = “good morning india\n”;

strcpy(strc, str);

printf(“%s\n”, strc);

return 0;

}

a) hello world

b) hello worldg india

c) Compile time error

d) Undefined behaviour

3.What is the output of this C code?

#include <stdio.h>

int main()

{

char *str = “hello, world!!\n”;

char strc[] = “good morning\n”;

strcpy(strc, str);

printf(“%s\n”, strc);

return 0;

}

a) hello, world!!

b) Compile time error

c) Undefined behaviour

d) Segmenation fault

4.What is the output of this C code?

#include <stdio.h>

int main()

{

char *str = “hello, world\n”;

str[5] = ‘.’;

printf(“%s\n”, str);

return 0;

}

a) hello. world

b) hello, world

c) Compile error

d) Segmentation fault

5.What is the output of this 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

6.What is the output of this C code?

#include <stdio.h>

int main()

{

char *str = “hello world”;

char strary[] = “hello world”;

printf(“%d %d\n”, sizeof(str), sizeof(strary));

return 0;

}

a) 11 11

b) 12 12

c) 4 12

d) 4 11

7.What is the output of this C code?

#include <stdio.h>

int main()

{

char *str = “hello world”;

char strary[] = “hello world”;

printf(“%d %d\n”, strlen(str), strlen(strary));

return 0;

}

a) 11 11

b) 12 11

c) 11 12

d) x 11 where x can be any positive integer.

8.What is the output of this C code?

#include <stdio.h>

void f(char *k)

{

k++;

k[2] = ‘m’;

printf(“%c\n”, *k);

}

void main()

{

char s[] = “hello”;

f(s);

}

a) l

b) e

c) h

d) o

9.What is the output of this C code?

#include <stdio.h>

void fun(char *k)

{

printf(“%s”, k);

}

void main()

{

char s[] = “hello”;

fun(s);

}

a) hello

b) Run time error

c) Nothing

d) h

10.Comment on the output of this C code?

#include <stdio.h>

int main()

{

char *str = “This” //Line 1

char *ptr = “Program\n”; //Line 2

str = ptr; //Line 3

printf(“%s, %s\n”, str, ptr); //Line 4

}

a) Memory holding “this” is cleared at line 3

b) Memory holding “this” loses its reference at line 3

c) You cannot assign pointer like in Line 3

d) Output will be This, Program

11.What type initialization is needed for the segment “ptr[3] = ‘3’;” to work?

a) char *ptr = “Hello!”;

b) char ptr[] = “Hello!”;

c) Both (a) and (b)

d) None of the mentioned

12.The syntax for constant pointer to address (i.e., fixed pointer address) is:

a) const <type> * <name>

b) <type> * const <name>

c) <type> const * <name>

d) Both (a) and (c)

13.Comment on the output of this C code?

#include <stdio.h>

int add(int a, int b)

{

return a + b;

}

int main()

{

int (*fn_ptr)(int, int);

fn_ptr = add;

printf(“The sum of two numbers is: %d”, (int)fn_ptr(2, 3));

}

a) Compile time error, declaration of a function inside main.

b) Compile time error, no definition of function fn_ptr.

c) Compile time error, illegal application of statement fn_ptr = add.

d) No Run time error, output is 5.

14.The correct way to declare and assign a function pointer is done by:

(Assuming the function to be assigned is “int multi(int, int);”)

a) int (*fn_ptr)(int, int) = multi;

b) int *fn_ptr(int, int) = multi;

c) int *fn_ptr(int, int) = &multi;

d) Both (b) & (c)

15.Calling a function f with a an array variable a[3] where a is an array, is equivalent to

a) f(a[3])

b) f(*(a + 3))

c) f(3[a])

d) All of the mentioned

16.What is the output of this C code?

#include <stdio.h>

void f(char *k)

{

k++;

k[2] = ‘m’;

}

void main()

{

char s[] = “hello”;

f(s);

printf(“%c\n”, *s);

}

a) h

b) e

c) m

d) o;

17.What is the output of this C code?

#include <stdio.h>

void main()

{

char s[] = “hello”;

s++;

printf(“%c\n”, *s);

}

a) Compile time error

b) h

c) e

d) o