Point Out Correct Statements

Question 1 :

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);
Answer : Option D

Question 2 :

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);
Answer : Option B

Question 3 :

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));
Answer : Option D