$ cat test.c
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main() {
    int *p, n=0,sum=0,i=0;
    clock_t srt_time, end_time;
    
    srt_time = clock();

    printf("Enter number of Items you want to add : ");
    scanf("%d",&n);

    p = (int *) malloc(n * sizeof(int));

    for(i=0;i<n;i++)
    	scanf("%d",p+i);

    for(i=0;i<n;i++)
    	sum = sum + p[i];
    printf("Total sum = %d\n",sum);
    end_time = clock();

    printf("Total Time : %Lf\n",(long double) ((end_time-srt_time)/CLOCKS_PER_SEC));

    return 0;

}