C Programming :: Structures, Unions, Enums
1.How will you free the allocated memory ?
A. remove(var-name); B. free(var-name);
C. delete(var-name); D. dalloc(var-name);
Answer & Explanation
Answer: Option B
2.
What is the similarity between a structure, union and enumeration?
A. All of them let you define new values
B. All of them let you define new data types
C. All of them let you define new pointers
D. All of them let you define new structures
Answer & Explanation
Answer: Option B
1.
If the following structure is written to a file using fwrite(), can fread() read it back successfully?
struct emp
{
char *n;
int age;
};
struct emp e={"IndiaBIX", 15};
FILE *fp;
fwrite(&e, sizeof(e), 1, fp);
A. Yes B. No
Answer & Explanation
Answer: Option B
2.
size of union is size of the longest element in the union
A. Yes B. No
Answer & Explanation
Answer: Option A
3.
The elements of union are always accessed using & operator
A. Yes B. No
Answer & Explanation
Answer: Option B
4.
Will the following code work?
#include<stdio.h>
#include<alloc.h>
struct emp
{
int len;
char name[1];
};
int main()
{
char newname[] = "Rahul";
struct emp *p = (struct emp *) malloc(sizeof(struct emp) -1 +
strlen(newname)+1);
p->len = strlen(newname);
strcpy(p -> name, newname);
printf("%d %s\n", p->len, p->name);
return 0;
}
A. Yes B. No
Answer & Explanation
Answer: Option A
A pointer union CANNOT be created
A. Yes B. No
Answer & Explanation
Answer: Option B
