Memory Allocation

6: malloc() returns a NULL if it fails to allocate the requested memory.

A. True

B. False

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7: malloc() allocates memory from the heap and not from the stack.

A. True

B. False

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8

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(3*sizeof(int));

C. p = malloc(3*4*sizeof(int));

D. p = (int*) malloc(3*4*sizeof(int));

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9

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>

iint 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);

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10: 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);

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