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Yes / No Questions

Question 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={"IndiaParinam", 15};
FILE *fp;
fwrite(&e, sizeof(e), 1, fp);


A). Yes
B). No
Answer : Option B

Explanation :

Since the structure contain a char pointer while writing the structure to the disk using fwrite() only the value stored in pointer n will get written. so fread() fails to read.


Question 2 :

size of union is size of the longest element in the union


A). Yes
B). No
Answer : Option A

Question 3 :

The elements of union are always accessed using & operator


A). Yes
B). No
Answer : Option B

Question 4 :

Will the following code work?

#include < stdio.h >
#include < malloc.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 : Option A

Explanation :

The program allocates space for the structure with the size adjusted so that the name field can hold the requested name.


Question 5 :

A pointer union CANNOT be created


A). Yes
B). No
Answer : Option B