C Language - Malloc, Calloc, Realloc - use

 

#include <stdio.h>

#include <conio.h>

#include <string.h>

#include <stdlib.h>

int main()

{

//int i;

//int j;

//int *ptr;

//use of malloc

//printf ("Enter the size of the array \n");

//scanf ("%d", &j);

//ptr = (int *) malloc (j* sizeof(int));

//for (i=0; i<j; i++)

//{

// printf ("Enter a value of array %d\n", i);

// scanf ("%d", &ptr[i]); 

//} for (i=0; i<j; i++) 

//{

// printf ("The value at %d is %d\n", i, ptr[i]);

//} 

//use of calloc....

int i;

int j;

int *ptr;

printf ("Enter the size of the array \n");

scanf ("%d", &j);

ptr = (int *) calloc (5,  sizeof(int));

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

{

printf ("Enter a value of array %d\n", i);

scanf ("%d", &ptr[i]); 

} 

for (i=0; i<5; i++) 

{

printf ("The value at %d is %d\n", i, ptr[i]);

} 

//use of realloc...

printf ("Enter new size of the array you want \n");

scanf ("%d", &j);

ptr = (int *) realloc (ptr, 5* sizeof(int));

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

{

printf ("Enter a value of array %d\n", i);

scanf ("%d", &ptr[i]); 

} 

for (i=0; i<5; i++) 

{

printf ("The value at %d is %d\n", i, ptr[i]);

} 

//use of free...

return 0;

}

// ScreenShots: