Structure & Union Questions and Answers
Structure & Union Questions with Answers are key topics in C programming questions and answers sections of competitive exams and technical interviews. These concepts allow efficient memory usage and data management, making them essential for understanding advanced C applications. Commonly featured in TCS, Infosys, and Tech Mahindra placement tests, questions on structure and union test your ability to differentiate between memory allocation, member access, and implementation. Practicing C programming MCQs with explanations improves conceptual clarity and debugging skills. Start your preparation with our curated C Structure & Union MCQs and download free PDFs for revision.
Structure & Union
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95 questions
71. Find the output union india { int i; char ch[2]; } orissa; void main ( ) { orissa.ch[0]=1; orissa.ch[1]=2; printf("%d", orissa.i); }
- 513
- 257
- 21
- 12
72. Find the output union abc { int x; char c; struct str { int a; char b; char c; }p; }q; void main ( ) { printf('%d", sizeof(q)); }
- 2
- 4
- 7
- Compiltion error
73. Find the output union xxx { int x; float y; }xx; void func(union xxx x); void main ( ) { xx.x=10; xx.y=3.14; func(xx); printf("%d", xx.x); } void func (union xxx xx { xx.x=20; printf("%d", xx.x); return; }
- Garbage Garbage
- 20 Garbage
- Garbage 20
- Compilation error
74. Find the output union sbi { int i; char ch[2]; }; void main ( ) { union sbi idco={127}; printf('%d %d%d", idco.i, idco.ch[0], idco.ch[1]); }
- 127 127 0
- 127 127 127
- 127 Garbage Garbage
- 127 127 Garbage
75. Find the output. union uni { int x; char y; }; void main ( ) { union uni u; u.x =90; printf("%c", u.y); }
- 9
- Z
- Compilation error
- None of these
76. Find the output union res { char a:6; int b:8; }; void main ( ) { union res s; pintf("%d", sizeof (s)); }
- 14
- 8
- 1
- 2
77. Find the output. union res { int a:16; char b:10; }; void main ( ) { union res s; s.b='B'; s.a=10; printf('%c%d", s.b, s.a); }
- 2048 10
- B 2144
- B 10
- Compilation error
78. Find the output union uni int x; int a:8; char b:8; }; void main ( ) { union uni u={48}; printf('%d %d", u.a, u.b); }
- Invalid initialization
- 48 0
- 48 48
- 0 0
79. Find out the true statement.
- A union variable can be assigned to another union variable.
- The address of union variable can be extracted by using & operator.
- A function can return a pointer to the union
- All of the above
80. Which member of a union is in use at any time can be known explicitly using
- Enum
- Bit fields
- Static members
- Can't be determined