C Programming – Character Pointers and Functions

C Programming – Character Pointers and Functions

Question 1

What is the output of this C code?

        #include 
        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

Question 2

What is the output of this C code?

        #include 
        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

Question 3

What is the output of this C code?

        #include 
        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

Question 4

What is the output of this C code?

        #include 
        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

Question 5

What is the output of this C code?

        #include 
        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

Question 6

What is the output of this C code?

        #include 
        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

Question 7

What is the output of this C code?

        #include 
        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

Question 8

What is the output of this C code?

    #include 
    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

Question 9

What is the output of this C code?

    #include 
    void fun(char *k)
    {
    printf("%s", k);
    }
    void main()
    {
    char s[] = "hello";
    fun(s);
    }

A	hello
B	Run time error
C	Nothing
D	h

Question 10

Comment on the output of this C code?

    #include 
    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

Question 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

Question 12

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

A	const *
B	* const
C	const *
D	Both (a) and (c)

Question 13

Comment on the output of this C code?

    #include 
    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.

Question 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)

Question 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

Question 16

What is the output of this C code?

    #include 
    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

Question 17

What is the output of this C code?

    #include 
    void main()
    {
    char s[] = "hello";
    s++;
    printf("%c\n", *s);
    }

A	Compile time error
B	h
C	e
D	o

Check Your Answers:

  1. B

  2. A

  3. C

  4. D

  5. A

  6. C

  7. A

  8. B

  9. A

10. B

11. B

12. B

13. D

14. A

15. D

16. A

16. A

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