What is the purpose of using structures in C programming?

• To perform mathematical operations

• To group variables of different data types

• To define functions

• To print output

What is the output of the below pseudo code?

struct Student {

int roll_number;

char name[20]; };

int main() {

struct Student s;

s.roll_number = 101;

strcpy(s.name, "John Doe");

printf("%d %s", s.roll_number, s.name);

return 0; }

• 101

• 101 John Doe

• Error

• John Doe

How do you access a member of a structure variable in C?

• Using the dot operator (.)

• Using the arrow operator (->)

• Using the star operator (*)

• Using the hash operator (#)

What will be the output of the above pseudo code?

union Data {

int num;

char letter;

};

int main() {

union Data d;

d.num = 65;

printf("%d %c", d.num, d.letter);

return 0;

}

• 65 A

• 65

• Error

• A

Which of the following is true about arrays of structures in C?

• Arrays can store structures of the same type

• Arrays can store structures of different types

• Arrays can only store integers

• Arrays cannot store structures

What will be the output of the above pseudo code?

void swap(int *a, int *b) {

int temp = *a;

*a = temp;

*b =*a;

}

int main() {

int x = 5, y = 10;

swap(&x, &y);

printf("%d %d", x, y);

return 0;

}

• 10 10

• 5 10

• 5 5

• 10 5

Which operator is used to access the value pointed to by a pointer in C?

• Hash operator (#)

• Arrow operator (->)

• Dot operator (.)

• Star operator (*)

What will the content of the "data.txt" file after executing the above pseudo code?

FILE *fp; int main() {

fp = fopen("data.txt", "w");

fprintf(fp, "Hello, World!");

fclose(fp);

return 0;

}

• Hello, World!

• Nothing

• Error

• Undefined

How do you define and open a file in C?

• define_file(file_name);

• open_file(file_name);

• fopen(file_name, mode);

• create_file(file_name);

What is the output of the above pseudo code?

struct Point {

int x; int y; };

int main() {

struct Point p = {3, 7};

struct Point *ptr = &p;

printf("%d %d", ptr->x, ptr->y);

return 0;

}

• 3 7

• 7 3

• Undefined

• Error