Union in C Language - Quiz

Q: Size of a union is determined by size of the.

Q: What type of data is holded by variable u int this C code?

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

Q: What will be the output of the program?

#include"stdio.h"

int main()
{
    union var
    {
        int a, b;
    };
    union var v;
    v.a=10;
    v.b=20;
    printf("%d\n", v.a);
    return 0;
}

Q: What will be the output of the program in 16 bit platform (Turbo C under DOS)?

#include"stdio.h"

int main()
{
    struct value
    {
        int bit1:1;
        int bit3:4;
        int bit4:4;
    }bit;
    printf("%d\n", sizeof(bit));
    return 0;
}

Q: What will be the output of the program in Turbo C (under DOS)?

#include<stdio.h>

int main()
{
    struct emp
    {
        char *n;
        int age;
    };
    struct emp e1 = {"Dravid", 23};
    struct emp e2 = e1;
    strupr(e2.n);
    printf("%s\n", e1.n);
    return 0;
}

Q: What will be the output of the program in 16-bit platform (under DOS)?

#include<stdio.h>

int main()
{
    struct node
    {
        int data;
        struct node *link;
    };
    struct node *p, *q;
    p = (struct node *) malloc(sizeof(struct node));
    q = (struct node *) malloc(sizeof(struct node));
    printf("%d, %d\n", sizeof(p), sizeof(q));
    return 0;
}

Q: What will be the output of the program?

#include<stdio.h>

int main()
{
    enum days {MON=-1, TUE, WED=6, THU, FRI, SAT};
    printf("%d, %d, %d, %d, %d, %d\n", ++MON, TUE, WED, THU, FRI, SAT);
    return 0;
}

Q: What is the output of this C code?

    #include <stdio.h>
    union
    {
        int x;
        char y;
    }p;
    int main()
    {
        p.y = 60;
        printf("%d\n", sizeof(p));
    }

Q: What is the output of this C code?

    #include <stdio.h>
    union p
    {
        int x;
        char y;
    }k = {1, 97};
    int main()
    {
        printf("%d\n", k.y);
    }

Q: Which of the following share a similarity in syntax?
1. Union, 2. Structure, 3. Arrays and 4. Pointers