Sum of all Array elements means add all array Elements. Suppose we have 5 Elements in array and we want to find there sum.
arr[0]=1 arr[1]=2 arr[2]=3 arr[3]=4 arr[4]=5
Sum off all above elements are
arr[0]+arr[1]+arr[2]+arr[3]+ arr[4]=1+2+3+4+5=15
Input:1,2,3,4,5 Output:15
Explanation
Using For loop to get to the every index element and taking sum of them
arr[0]+arr[1]+arr[2]+arr[3]+ arr[4]=1+2+3+4+5=15
Example
#include <iostream>
using namespace std;
int main() {
int i,n,sum=0;
int arr[]={1,2,3,4,5};
n=5;
for(i=0;i<n;i++) {
sum+=arr[i];
}
cout<<sum;
return 0;
}