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Thanks for the knowledge

so i tried to use it and wrote this code for a dynamic size stack kind of thing...



#include<stdio.h>

int *a;
int top=0;

Hello everyone,
i am studying dynamic memory allocation in c,which can be done by using malloc calloc and realloc.
But still i don't understand the concept.
for eg
int *p;
p=(int*)malloc(100);...