try yourself |run program

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>

void main(){
int n,i,*ptr,sum=0;
clrscr();
printf("\nEnter number of elements: ");
scanf("%d",&n);
ptr=(int*)malloc(n*sizeof(int));
if(ptr==NULL)
{
printf("\nSorry! Number of element has not given by you.");
exit(0);
}
for(i=0;i< n;i++)
{
printf("\nEnter elements of array: ");
scanf("%d",ptr+i);
}
for(i=0;i< n;i++)
{ printf("\n given element: %d",*(ptr+i));
sum = sum + *(ptr+i);
}
printf("\n Sum=%d",sum);
free(ptr);
getch();
}

Program Output

Enter number of elements: 5
Enter elements of array: 10
Enter elements of array: 20
Enter elements of array: 30
Enter elements of array: 40
Enter elements of array: 50
given element: 10
given element: 20
given element: 30
given element: 40
given element: 50
Sum=150