C Programming Language : Proficients

1. Which of the following can never be sent by call-by-value?

Array
Structures
Variable
Both Array & Structures

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

char ptr[] = “Hello!”;
char *ptr = “Hello!”;
Both char *ptr = “Hello!”; and char ptr[] = “Hello!”;
None of the above.

3. Which of the correct option for this expression?

    void (*ptr)(int);
                    

ptr is pointer to int that converts its type to void.
ptr is pointer to void that converts its type to int.
ptr is pointer to function passing void returning int.
ptr is pointer to function passing int returning void

4. What will be the output of the code ________?

    #include<stdio.h>

    void m(int *p, int *q)

    {

        int temp = *p; *p = *q; *q = temp;
        
    }
        
    void main()

    {

        int a = 11, b = 10;

        m(&a, &b);

        printf("%d %d\n", a, b);
        
    }

10 10
11 11
10 11
11 10

5. What will be the output of the code ________?

    #include<stdio.h>

    void m(int p, int q)

    {

        int temp = p;

        p = q;
        
        q = temp;

    }

    void main()

    {

        int a = 11, b =10;

        m(a, b);
        
        printf("%d %d\n", a, b);

    }

10 10
11 11
10 11
11 10

6. What will be the output of the 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
        
    }

Memory holding “this” is cleared at line 3.
Memory holding “this” loses its reference at line 3.
You cannot assign pointer like in Line 3.
Error in line 1.

7. What will be the output of the code ________?

    #include<stdio.h>

    struct student

    {

        int no = 5;

        char name[20];

    };

    void main()

    {

        struct student s;
        
        s.no = 8;
        
        printf("Minigranth");

    }

Minigranth
Nothing
Infinite
Compile Time Error

8. Is this declaration correct?

    int* ((*x)())[2];

Undefined behaviour
Depends on the compiler
Correct
Incorrect

9. What will be the output of the code ________?

    #include<stdio.h>

    void m(int p, int q)

    {

        int lookup[100] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
        
        printf("%d", lookup[3]);

    }

2
3
4
Compile Time Error

10. What will be the output of the code ________?

    #include<stdio.h>

    typedef struct p *q;

    struct p

    {

        int x;
        
        char y;
        
        q ptr;

    };

    int main()
    {

        struct p p = {1, 2, &p};
        
        printf("%d\n", p.ptr->ptr->x);
        
        return 0;

    }

1
Compile Time Error
Segmentation Fault
Undefined Behaviour