C_136 Deallocating the Dynamically Allocated Memory using free() | C Programming Tutorials

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int *p = (int *)malloc(sizeof(int));
*p = 3;
free(p);
p = (int *)malloc(2 * sizeof(int));
*p = 33;
*(p + 1) = 333;
printf("%d %d", *(p + 1), *p);
free(p);

[hariparuchuru]

two times freeing in a program

#include<stdio.h>
#include<stdlib.h>
void main()
{
int n, i, *ptr;
float *ptr1;
printf("Enter the no of values");
scanf("%d", &n);
ptr = (int*)calloc(n, sizeof(int));
printf("\nEnter the Values");
for(i=0;i<n;i++)
{
scanf("%d", (ptr+i));
}
printf("\nEntered Values are");
for(i=0;i<n;i++)
{
printf("%d\t", *(ptr+i));
}
free(ptr);
printf("\nEnter of values");
scanf("%d", &n);
ptr1=
printf("\nEnter the values");
for(i=0;i<n;i++)
{
scanf("%f", (ptr1+i));
}
printf("\nEntered Values are");
for(i=0;i<n;i++)
{
printf("%f\t", *(ptr1+i));
}
free(ptr1);
}

[gladsonjeremias]

Hello Madam! After freeing the pointer, can't we delete it completely, rather than assigning NULL value to it?

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[PriteshGuptaa]

Why didn't you freed the local ptr inside display()?
Or is it because you passed ptr into ptr1, meaning you are anyways freeing the allocated memory space?