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Q1. Sum of Array Elements

Find the sum of all elements in an array. 
#include <stdio.h>

int main() {
    int n, sum = 0;
    scanf("%d", &n);
    int arr[n];
    for (int i = 0; i < n; i++) scanf("%d", &arr[i]);
    for (int i = 0; i < n; i++) sum += arr[i];
    printf("Sum = %d\n", sum);
    return 0;
}

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Q2. Largest Element

Find the largest element in an array. 
#include <stdio.h>

int main() {
    int n;
    scanf("%d", &n);
    int arr[n];
    for (int i = 0; i < n; i++) scanf("%d", &arr[i]);
    int max = arr[0];
    for (int i = 1; i < n; i++)
        if (arr[i] > max) max = arr[i];
    printf("Largest = %d\n", max);
    return 0;
}

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Q3. Reverse an Array

Print array elements in reverse order. 
#include <stdio.h>

int main() {
    int n;
    scanf("%d", &n);
    int arr[n];
    for (int i = 0; i < n; i++) scanf("%d", &arr[i]);
    for (int i = n - 1; i >= 0; i--)
        printf("%d ", arr[i]);
    printf("\n");
    return 0;
}