📘 Lesson · Lesson 57

Dynamic Memory (malloc/free)

What is Dynamic Memory?

💡 Note

Dynamic memory is memory allocated at run-time from the heap using malloc/calloc, resized with realloc, and released with free.

The Functions

Function	Use
malloc(n)	allocate n bytes (uninitialized)
calloc(n,size)	allocate and set to zero
realloc(p,n)	resize an existing block
free(p)	release the memory

Example

#include <stdio.h>
#include <stdlib.h>
int main() {
    int *arr = (int*) malloc(3 * sizeof(int));
    arr[0]=10; arr[1]=20; arr[2]=30;
    printf("%d\n", arr[1]);   // 20
    free(arr);                 // always free!
    return 0;
}

Output:
20

Summary

malloc/calloc allocate heap memory; realloc resizes; free releases it.
Always free to avoid memory leaks.

Dynamic Memory क्या है?

💡 Note

Dynamic memory run-time पर heap से malloc/calloc से allocate होती है, realloc से resize, और free से release।

Functions

Function	Use
malloc(n)	n bytes allocate (uninitialized)
calloc(n,size)	allocate और zero set
realloc(p,n)	मौजूदा block resize
free(p)	memory release

Example

#include <stdio.h>
#include <stdlib.h>
int main() {
    int *arr = (int*) malloc(3 * sizeof(int));
    arr[0]=10; arr[1]=20; arr[2]=30;
    printf("%d\n", arr[1]);   // 20
    free(arr);                 // हमेशा free करें!
    return 0;
}

Output:
20

सारांश

malloc/calloc heap memory allocate; realloc resize; free release करता है।
Memory leaks से बचने को हमेशा free करें।

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