Structure and Union
practice.

Which of the following is an incorrect syntax to pass by reference a member of a structure in a function?

(Assume: struct temp{int a;}s;)

What will be the output of the following C code?

#include <stdio.h>
struct student
{
};
void main()
{
    struct student s[2];
    printf("%d", sizeof(s));
}

What will be the output of the following C code?

#include <stdio.h>
struct point
{
    int x;
    int y;
} p[] = {1, 2, 3, 4, 5};
void foo(struct point*);
int main()
{
    foo(p);
}
void foo(struct point p[])
{
    printf("%d %d\n", p->x, p[2].y);
}

Which of the following is not possible under any scenario?

Calculate the % of memory saved when bit-fields are used for the following C structure as compared to with-out use of bit-fields for the same structure? (Assuming size of int = 4)

struct temp
{
    int a : 1;
    int b : 2;
    int c : 4;
    int d : 4;
}s;

What will be the output of the following C code?

#include <stdio.h>
typedef struct student
{
    char *a;
}stu;
void main()
{
    struct stu s;
    s.a = "hi";
    printf("%s", s.a);
}

What will be the output of the following C code?

#include <stdio.h>
void main()
{
    struct student
    {
        int no;
        char name[20];
    };
    struct student s;
    s.no = 8;
    printf("%d", s.no);
}

Which of the following statement is true?

What will be the output of the following C code?

#include <stdio.h>
union u
{
    struct p
    {
        unsigned char x : 2;
        unsigned int y : 2;
    };
    int x;
};
int main()
{
    union u u;
    u.p.x = 2;
    printf("%d\n", u.p.x);
}

Which of the given option is the correct method for initialization?

typedef char *string;

What will be the output of the following C code?

#include <stdio.h>
struct p
{
    int x;
    char y;
};
int main()
{
    struct p p1[] = {1, 92, 3, 94, 5, 96};
    struct p *ptr1 = p1;
    int x = (sizeof(p1) / 3);
    if (x == sizeof(int) + sizeof(char))
        printf("%d\n", ptr1->x);
    else
        printf("falsen");
}

Which of the following will stop the loop at the last node of a linked list in the following C code snippet?

struct node
{
    struct node *next;
};

In the following declaration of bit-fields, the constant-expression must be . . . . . . . .

struct-declarator:
declarator
type-specifier declarator opt : constant-expression

What will be the output of the following C code?

#include <stdio.h>
struct p
{
    int x;
    int y;
};
int main()
{
    struct p p1[] = {1, 2, 3, 4, 5, 6};
    struct p *ptr1 = p1;
    printf("%d %d\n", ptr1->x, (ptr1 + 2)->x);
}

What would be the size of the following union declaration? (Assuming size of double = 8, size of int = 4, size of char = 1)

#include <stdio.h>
union uTemp
{
    double a;
    int b[10];
    char c;
}u;

What will be the output of the following C code?

#include <stdio.h>
union p
{
    int x;
    float y;
};
int main()
{
    union p p, b;
    p.x = 10;
    printf("%f\n", p.y);
}

What will be the output of the following C code?

#include <stdio.h>
struct student fun(void)
{
    struct student
    {
        char *name;
    };
    struct student s;
    s.name = "alan";
    return s;
}
void main()
{
    struct student m = fun();
    printf("%s", m.name);
}

In what situation, install function returns NULL?

What will be the output of the following C 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;
}

What will be the output of the following C code according to C99 standard?

#include <stdio.h>
struct p
{
    int k;
    char c;
    float f;
};
int main()
{
    struct p x = {.c = 97};
    printf("%f\n", x.f);
}