C Dynamic Memory Allocation Test – 2

1. What will be the error (if any) in the following C code?

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main()
{
    char *p;
    *p = (char)calloc(10);
    strcpy(p, "HELLO");
    printf("%s", p);
    free(p);
    return 0;
}

2. If malloc() and calloc() are not type casted, the default return type is ___________

3. What will be the output of the following C code? (Given that the size of array is 4 and new size of array is 5)

#include<stdio.h>
#include<stdlib.h>
main()
{
    int *p,i,a,b;
    printf("Enter size of array");
    scanf("%d",&a);
    p=(int*)malloc(a*sizeof(int));
    for(i=0;i<a;i++)
    printf("%d\n",i);
    printf("Enter new size of array");
    scanf("%d",&b);
    realloc(p,b);
    for(i=0;i<b;i++)
    printf("%d\n",i);
    free(p);
}

4. Pick out the correct statement with respect to the heap.

5. The number of arguments taken as input which allocating memory dynamically using malloc() is ___________

6. When the pointer is NULL, then the function realloc is equivalent to the function ___________

7. Suppose we have a one dimensional array, named ‘x’, which contains 10 integers. Which of the following is the correct way to allocate memory dynamically to the array ‘x’ using malloc()?

8. Garbage collector frees the programmer from worrying about ___________

9. What will be the output of the following C code if it is executed on a 32 bit processor?

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int *p;
    p = (int *)malloc(20);
    printf("%d\n", sizeof(p));
    free(p);
    return 0;
}

10. If the space in memory allocated by malloc is not sufficient, then an allocation fails and returns ___________