Structure and Union
practice.

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, .k = 1, 3};
    printf("%f \n", x.f);
}

What will be the output of the following C code?

#include <stdio.h>
struct student
{
    int no = 5;
    char name[20];
};
void main()
{
    struct student s;
    s.no = 8;
    printf("hello");
}

What will be the output of the following C code?

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

What will be the output of the following C code?

#include <stdio.h>
typedef int integer;
int main()
{
    int i = 10, *ptr;
    float f = 20;
    integer j = i;
    ptr = &j;
    printf("%d\n", *ptr);
    return 0;
}

What happens when install(s, t) finds that the name being installed is already present in the table?

What will be the output of the following C code?

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

What will be the output of the following C code?

#include <stdio.h>
struct student
{
    char *c;
};
void main()
{
    struct student m;
    struct student *s = &m;
    (*s).c = "hello";
    printf("%s", m.c);
}

Which member of the union will be active after REF LINE in the following C code?

#include <stdio.h>
union temp
{
    int a;
    float b;
    char c;
};
union temp s = {1,2.5,’A’}; //REF LINE

Which of the following return-type cannot be used for a function in C?

What will be the output of the following C code?

#include <stdio.h>
struct
{
    int k;
    char c;
} p;
int p = 10;
int main()
{
    p.k = 10;
    printf("%d %d\n", p.k, p);
}

What will be the output of the following C code?

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

What will be the output of the following C code?

#include <stdio.h>
struct p
{
    unsigned int x : 2;
    unsigned int y : 2;
};
int main()
{
    struct p p;
    p.x = 3;
    p.y = 1;
    printf("%d\n", sizeof(p));
}

What type of data is holded by variable u int in the following C code?

#include <stdio.h>
union u_tag
{
    int ival;
    float fval;
    char *sval;
} u;

What will be the output of the following C code?

#include <stdio.h>
typedef struct p
{
    int x, y;
};
int main()
{
    p k1 = {1, 2};
    printf("%d\n", k1.x);
}

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, .f = 3, .k = 1};
    printf("%f\n", x.f);
}

What will be the output of the following C code?

#include <stdio.h>
struct p
{
    unsigned int x : 2;
    unsigned int y : 2;
};
int main()
{
    struct p p;
    p.x = 3;
    p.y = 4;
    printf("%d\n", p.y);
}

What will be the output of the following C code?

#include <stdio.h>
void main()
{
    int lookup[100] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
    printf("%d", lookup[3]);
}

What will be the output of the following C code?

#include <stdio.h>
typedef struct p
{
    int x, y;
}k = {1, 2};
int main()
{
    p k1 = k;
    printf("%d\n", k1.x);
}

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    struct p
    {
        char *name;
        struct p *next;
    };
    struct p *ptrary[10];
    struct p p, q;
    p.name = "xyz";
    p.next = NULL;
    ptrary[0] = &p;
    q.name = (char*)malloc(sizeof(char)*3);
    strcpy(q.name, p.name);
    q.next = &q;
    ptrary[1] = &q;
    printf("%s\n", ptrary[1]->next->next->name);
}

Which of the following is not allowed?