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
81. Find the output union unit { int x; char y; }; union neon { union unit u; char ch; }; void main ( ) { union neon n={50}; printf("%d %c %c", n.u.x, n.ch, n.u.y); }
- 50 2 2
- 50 garbage garbage
- 50 50 50
- 50 2 garbage
82. Find the output union uuu { struct student { int roll; char name [10]; float percentage; }; float sal; }; void main ( ) { union uuu u; printf('%d", sizeof (u)); }
- 4
- 10
- 16
- Error, too many types in declaration
83. State the correct statement
- Union declaration reservesd memory but definition doesn't.
- Structure declaration reserves memory but definition doesn't
- Data members of structure are private by default.
- None of the above
84. Find the output union un { int x; char y; float z; }; void main ( ) { union un *u; u=(union un*) malloc (sizeof(union un)); u->x=10; u->'a' printf("%d", u->x); }
- 10
- 97
- Garbage output
- Compilation error
85. Which is not possible with union ?
- Array of union
- Pointer to union
- Self-referential union
- None of the above
86. Find the output #define MAX int a union uuu { MAX; float b; }; void main ( ) { union uuu u={5.5}; printf('%d", u.a); }
- 5.0
- 5
- Compilation error
87. Which of the following is used to increment the pointer "p" to next member of the array? union choice { int x[10]; float f[10]; }; union choice colour[15]; void *p=colour;
- p=p+sizeof(choice.x);
- p=p+sizeof)*p);
- p=(void*)((union choice *) p+a);
- p=(void*)(union choice *)p;
88. Find the output union xyz { char name [10]; char x; }; void main ( ) { union xyzp={"raja")}; p.x='i\r'; p.x='ij'; printf("%s", p.name); }
- iija
- iaja
- jaja
- None of these
89. Find the output union abc { int ; float f; }ab; void main ( ) { ab.i=23.567; printf('%f", ab.f); }
- 23.567
- 23.0000
- suffering
- None of these
90. Find the output union uni { int x; char: 8; }; void main ( ) { union uni u={64}; printf("%c"); }
- A
- Garbage
- Declaration terminated incorrectly
- None of these