Question

Code in C

#### Array of pointers
1. Define a structure.
2. Allocate a *dynamic* array of **pointers** to structures. What is the type of the array variable?
3. Sketch the array on the worksheet.
3. Assign values in a loop.
4. Free all dynamic memory. Mind the order to avoid leaving dangling pointers!

Answer 1

#include <stdio.h>

#include <stdlib.h>

struct my_struct{

int key;

};

int main(void) {

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

for(int i=0;i<5;++i){

arr[i] = (struct my_struct *)malloc(sizeof(struct my_struct));

arr[i]->key = i;

}

printf("Values are: \n");

for(int i=0;i<5;++i){

printf("Key is: %d\n",arr[i]->key);

}

printf("Freeing Memory\n");

for(int i=0;i<5;++i){

free(arr[i]);

}

free(arr);

printf("Freed Memory\n");

return 0;

}

==============================================
1) Structure is defined with name my_struct
2) Using malloc we created array of pointers and its type is struct my_struct *
3) Using loop we added value and memory was freed


Thanks, PLEASE COMMENT if there is any concern.