Question

Rewrite the C PROGRAMMING LANGUAGE CODE in terms of only dereferencing (*) and pointer addition (+) AND extend the code so that allocated memory is freed properly. Thank you

struct foo {

int a;

char b;

};

int main(void)

{

struct foo* arr[5];

int x;
for(x = 0; x < 5; x++)

{

arr[x] = malloc(sizeof(struct foo));

arr[x]->a = 0;
arr[x]->b = 'b';

}

}

Answer 1

Ans

Statement

struct foo* arr[5] creates array of pointers of size 5. Then allocate to each element.

Make 2d dynamic array

a[b] is equivalent to *(a+b)

.

.

code:-

struct foo {

int a;

char b;

};

int main(void)

{//dynamic 2D array of size 5xsize of struct

struct foo** arr =(struct foo**)malloc(5*sizeof(struct foo));

int x;

for(x = 0; x < 5; x++)

{//for each element of foo

//allocate struct

*(arr+x) =(struct foo*)malloc(sizeof(struct foo));

//set member a

(*(arr+x))->a = 0;

//set member b

(*(arr+x))->b = 'b';

}

screenshot with output

.

..

If any doubt ask in the comments.