ResizeArr.c

//CS50 Lecture-5  Data structures
//Resizing Array
#include<stdio.h>
#include<stdlib.h>
int  main(void)
{
    int *list = malloc(3*sizeof(int));
    if(list == NULL)
    {
        return 1;
    }
    list[0] = 1;
    list[1] = 2;
    list[2] = 3;

    int *tmp = malloc(4*sizeof(int));
    if(tmp == NULL)
    {
        free(list);//if tmp is not valid, before returning the control[Getting out of main] free the memory allocated to list.
        return 1;
    }

    for(int i =0; i<3 ; i++)
    {
        tmp[i] = list[i];
    }
    tmp[3] = 4;
    free(list);
    list = tmp;

    for(int i =0; i<4; i++)
    {
        printf("%i\n",list[i]);
    }
    free(list);
    return 0;
}