Explore topic-wise MCQs in Structures, Unions, Enums.

What will be the output of the following C code?

 #include  enum example {a = 1, b, c}; enum example example1 = 2; enum example answer() { return example1; } int main() { (answer() == a)? printf("yes"): printf("no"); return 0; }

What will be the output of the following C code?

 main() { enum resut {pass, fail}; enum result s1,s2; s1=pass; s2=fail; printf("%d",s1); }

What will be the output of the following C code?

 #include enum class { a,b,c }; enum class m; main() { printf("%d",sizeof(m)); }

Pick the incorrect statement with respect to enums.

What is the output of this program?

 #include  void main() { struct number { int no; char name[20]; }; struct number s; s.no = 50; printf("%d", s.no); }

For the following function call which option is not possible? func(&s.a); //where s is a variable of type struct and a is the member of the struct.

Which of the following is an incorrect syntax to pass by reference a member of a structure in a function?

 (Assume: struct temp{int a;}s;)

Number of bytes in memory taken by the below structure is

 #include  struct test { int k; char c; };

Which of the following are incorrect syntax for pointer to structure?

 (Assuming struct temp{int b;}*my_struct;)

What is the output of this program?

 #include  struct student { char *c; }; void main() { struct student s[2]; printf("%d", sizeof(s)); }

What is the output of this program?

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

What is the output of this program?

 #include  struct employee { char *empname; int salary; }; int main() { struct employee e, e1; e.empname = "Sridhar"; e1 = e; printf("%s %s", e.empname, e1.empname); return 0; }

What is the output of this program?

 #include  int main(){ struct leader { char *lead; int born; }; struct leader l1 = {"AbdulKalam", 1931}; struct leader l2 = l1; printf("%s %d", l2.lead, l1.born); }

What is the output of this program?

 #include  int main(){ struct simp { int i = 6; char city[] = "chennai"; }; struct simp s1; printf("%d",s1.city); printf("%d", s1.i); return 0; }

What is the output of this program?

 #include  struct { int i; float ft; }decl; int main(){ decl.i = 4; decl.ft = 7.96623; printf("%d %.2f", decl.i, decl.ft); return 0; }

What is the output of this program?

 void main() { struct bitfields { int bits_1: 2; int bits_2: 9; int bits_3: 6; int bits_4: 1; }bit; printf("%d", sizeof(bit)); }

What is the output of this program?

 #include  int main() { enum days {MON=-1, TUE, WED=4, THU, FRI, SAT}; printf("%d, %d, %d, %d, %d, %d", MON, TUE, WED, THU, FRI, SAT); return 0; }

What is the output of this program?

 #include  void main() { struct demo{ char * a; int n; }; struct demo p = {"hello", 2015}; struct demo q = p; printf("%d", printf("%s",q.a)); }

What is the output of this program?

 #include  int main() { union demo { int x; int y; }; union demo a = 100; printf("%d %d",a.x,a.y); }

Which of the following accesses a variable in structure b?

What will be the size of the following structure?

 struct demo{ int a; char b; float c; }

What is the output of this program?

 #include  struct result{ char sub[20]; int marks; }; void main() { struct result res[] = { {"Maths",100}, {"Science",90}, {"English",85} }; printf("%s ", res[1].sub); printf("%d", (*(res+2)).marks); }

What is the output of this program?

 #include  struct test { int x; char y; } test; int main() { test.x = 10; test.y = 'A'; printf("%d %c", test.x,test.y); return 0; }

What is the output of this program?

 #include  struct test { int x = 0; char y = 'A'; }; int main() { struct test t; printf("%d, %c", s.x, s.y); return 0; }

Which of the following is a properly defined struct?

Which of the following accesses a variable in structure *b?

Which properly declares a variable of struct foo?

Which operator connects the structure name to its member name?

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; }

 #include 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; }

Consider the following C declaration

 struct { short s[5]; union { float y; long z; }u; } t;

Assume that objects of the type short, float and long occupy 2 bytes, 4 bytes and 8 bytes, respectively. The memory requirement for variable t, ignoring alignment considerations, is

Consider the following C declaration

 struct ( short s[5]; union { float y; long z; }u; }t;

Assume that the objects of the type short, float and long occupy 2 bytes, 4 bytes and 8 bytes, respectively. The memory requirement for variable t, ignoring alignment consideration, is

 #include stdio.h  int main() { struct site { char name[] = "GeeksQuiz"; int no_of_pages = 200; }; struct site *ptr; printf("%d ", ptr->no_of_pages); printf("%s", ptr->name); getchar(); return 0; }