Structures and Unions - C programming question bank with answers in multiple choice type
Questions
1
Size of the following union (assume size of int=2, size of float=4 and size of char=1);
union ABC
{
int a;
float b;
char c;
};
Answer: Option [B]
union is a data type in which all the members are stored in the same location. The memory size of union is equal to the memory size of the highest member variable. Each members of union can be accessed one by one. In this case size of float is 4. So the size of the union is 4.
2
What is wrong with the following code?
struct Person{
char *name;
struct Person Mother, Father;
}Anita;
Answer: Option [C]
struct is new data type which contains many different types of member variables under a single name.
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3
What will be the output of the following code?
struct abc{int a; int b;} v[3], *p;
main()
{
p=v;
p->a=3;
p->b=p->a;
printf("\n%d\t%d", v[0].a, v[0].b);
}
Answer: Option [D]
4
What will be the output of the following program?
main()
{
struct emp
{
char name[20];
int age;
float sal;
};
struct emp e={"Tiger"};
printf("\n%d%f"),e.age, e.sal;
}
Answer: Option [A]
5
What will be the output of the following code?
struct
{
int a;
double d;
float cp;
}s;
void main()
{
printf("%d\t%d\t%d\t%d", sizeof(s.a), sizeof(s.d), sizeof(s.cp), sizeof(s));
}
Answer: Option [A]
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