C-structures , bitfields,union and File Handling

Can the following C code be compiled successfully?

    #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);

    }

• Depends on the standard

• No

• Depends on the platform

• Yes

What will be the output of the following C code?

    #include <stdio.h>

    struct student

    {

        int no;

        char name[20];

    };

    void main()

    {

        student s;

        s.no = 8;

        printf("%d",s.no);

    }

• Nothing

• 8

• Compile time error

• Junk

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;

• 4

• 8

• 40

• 80

What will be the output of the following C code

#include <stdio.h>

union temp

{

int a;

float b;

char c;

};

int main()

{

union temp s = {1,2.5,’A’};

printf("%c",s.c);

return 0;

}

• '1'

• Compilation error

• 'A'

• Nothing

What will be the output of the following C code? (Assuming size of char = 1, int = 4, double = 8)

    #include <stdio.h>

    union utemp

    {

        int a;

        double b;

        char c;

    }u;

    int main()

    {

        u.c = 'A';

        u.a = 1;

        printf("%zu", sizeof(u));

    }

• 8

• 4

• 1

• 13

What is the output of this program? 

#include <stdio.h>

int main()

{

typedef struct tag {

char str[10];

int a;

} tag;

tag h1, h2 = { "IHelp", 10 };

h1 = h2;

h1.str[1] = 'h';

printf("%s, %d", h1.str, h1.a);

return 0;

}

• Error

• IHelp 10

• Ihelp 10

• No Error ,No output

What is the output of this program?

#include <stdio.h>

int main()

{

union test {

int i;

int j;

};

union test var = 10;

printf("%d, %d\n", var.i, var.j);

}

• 10,10

• garbage values

• Nothing

• Compilation Error

Assume that size of an integer is 32 bit. What is the output of following program?

#include<stdio.h>

struct st

{

static int x;

int y;

};

int main()

{

printf("%zu, sizeof(struct st));

return 0;

}

• 4

• 8

• Compile error

• Runtime error

Choose the correct output from the options given below:

#include<stdio.h>

struct st

{

int x;

struct st next;

};

int main()

{

struct st temp;

temp.x = 10;

temp.next = temp;

printf("%d", temp.next.x);

return 0;

}

• Compiler error

• 10

• Garbage Value

• Runtime error

Predict the output of above program. Assume that the size of an integer is 4 bytes and size of character is 1 byte. Also assume that there is no alignment needed.

union test

{

    int x; 

    char arr[4]; 

   int y;

};

int main()

{

    union test t;

    t.x = 0;

    t.arr[1] ='G';

    printf("%s", t.arr);

    return 0;

}

• Nothing is printed

• Garbage character followed by 'G'

• Garbage character followed by 'G', followed by more garbage characters

• Compiler Error