C Programming - Memory Allocation

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Exercise

"Act well your part; there all honor lies."

- Alexander Pope

Point out the correct statement will let you access the elements of the array using 'p' in the following program?

#include<stdio.h>
#include<stdlib.h>

int main()
{
    int i, j;
    int(*p)[3];
    p = (int(*)[3])malloc(3*sizeof(*p));
    return 0;
}

A.	`for(i=0; i<3; i++) { for(j=0; j<3; j++) printf("%d", p[i+j]); }`
B.	`for(i=0; i<3; i++) printf("%d", p[i]);`
C.	`for(i=0; i<3; i++) { for(j=0; j<3; j++) printf("%d", p[i][j]); }`
D.	`for(j=0; j<3; j++) printf("%d", p[i][j]);`

Which of the following statement is correct prototype of the malloc() function in c ?

A.	int* malloc(int);
B.	char* malloc(char);
C.	unsigned int* malloc(unsigned int);
D.	void* malloc(size_t);

Point out the correct statement which correctly free the memory pointed to by 's' and 'p' in the following program?

#include<stdio.h>
#include<stdlib.h>

int main()
{
    struct ex
    {
        int i;
        float j;
        char *s
    };
    struct ex *p;
    p = (struct ex *)malloc(sizeof(struct ex));
    p->s = (char*)malloc(20);
    return 0;
}

A.	free(p); , free(p->s);	B.	free(p->s); , free(p);
C.	free(p->s);	D.	free(p);

Point out the correct statement which correctly allocates memory dynamically for 2D array following program?

#include<stdio.h>
#include<stdlib.h>

int main()
{
    int *p, i, j;
    /* Add statement here */
    for(i=0; i<3; i++)
    {
        for(j=0; j<4; j++)
        {
            p[i*4+j] = i;
            printf("%d", p[i*4+j]);
        }
    }
    return 0;
}

A.	p = (int*) malloc(3, 4);
B.	p = (int) malloc(3sizeof(int));
C.	p = malloc(34sizeof(int));
D.	p = (int) malloc(34*sizeof(int));