Union in C Language - Quiz

Size of a union is determined by size of the.

  • AFirst member in the union
  • BLast member in the union
  • CBiggest member in the union
  • DSum of the sizes of all members

What would be the size of the following union declaration? 

    #include <stdio.h>
    union uTemp
    {
        double a;
        int b[10];
        char c;
    }u;
(Assuming size of double = 8, size of int = 4, size of char = 1)

  • A4
  • B8
  • C40
  • D80

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;
The variable u here

  • AWill be large enough to hold the largest of the three types;
  • BWill be large enough to hold the smallest of the three types;
  • CWill be large enough to hold the all of the three types;
  • DNone of the mentioned

What is the output of this C code(size of int and float is 4)? 
    #include "stdio.h"
    union
    {
        int ival;
        float fval;
    } u;
    void main()
    {
        printf("%d", sizeof(u));
    }

  • A16
  • B8
  • C4
  • D32

What will be the output of the program? 
#include"stdio.h"

int main()
{
    struct value
    {
        int bit1:1;
        int bit3:4;
        int bit4:4;
    }bit={1, 2, 13};

    printf("%d, %d, %d\n", bit.bit1, bit.bit3, bit.bit4);
    return 0;
}

  • A1, 2, 13
  • B1, 4, 4
  • C-1, 2, -3
  • D-1, -2, -13

What will be the output of the program? 

#include<stdio.h>

int main()
{
    enum status {pass, fail, absent};
    enum status stud1, stud2, stud3;
    stud1 = pass;
    stud2 = absent;
    stud3 = fail;
    printf("%d %d %d\n", stud1, stud2, stud3);
    return 0;
}

  • A0, 1, 2
  • B1, 2, 3
  • C0, 2, 1
  • D1, 3, 2

What will be the output of the program? 

#include<stdio.h>

int main()
{
    struct byte
    {
        int one:1;
    };
    struct byte var = {1};
    printf("%d\n", var.one);
    return 0;
}

  • A1
  • B-1
  • DError

What is the output of this C code? 

    #include <stdio.h>
    union p
    {
        int x;
        char y;
    };
    int main()
    {
        union p p, b;
        p.y = 60;
        b.x = 12;
        printf("%d\n", p.y);
    }

  • ACompile time error
  • BDepends on the compiler
  • C60
  • DUndefined behaviour

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);
    }

  • ACompile time error
  • B97
  • Ca
  • D 1

What value will be printed for data.c? 
#include 
#include 
void main()
{
union Data{
	int i;
	unsigned char c;
}data;

data.c = 'C';
data.i = 89;
printf("%c\n", data.c);

}

  • AC
  • BY
  • CG
  • DC89

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