Calculate Array Sum Using Only Pointers

Code

#include <stdio.h>

int calculate_sum(int *ptr, int n) {
    // Your logic here
    int *start = ptr;
    int *end = ptr + n -1;
    int res = 0;
    while(start<end){
        res += *start+*end;
        ++start;
        --end;
    }
    if((n%2)){
        res+=*start;
    }
    return res;
}

int main() {
    int n;
    scanf("%d", &n);

    int arr[100];
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }

    int result = calculate_sum(arr, n);
    printf("%d", result);

    return 0;
}

Solving Approach