CODEWITHSUNDEEP
c++arrays
willy
willy

Reputation: 263

how to find summation of all elements of array c++

I'm new to c++ but long story short , i want to write a c++ program that will accept input from user through an array and it will sum each array element input

 #include <iostream>
    #include <string>
    #include <math.h>
    using namespace std;
    int main() {
        int array[100];
        int sum;
    for(int i=0; i<100; i++){
      cout<<"Insert element "<<i<<": ";
      cin>>array[i];
      sum = array[i]+ //summ with the next array input;
cout<<sum;
      }
      return 0;
    }

means that if i enter any integer the program should be able to give the summation of the inputs in sequence from the first input to the last input

Upvotes: 0

Views: 1701

Answers (4)

Goswin von Brederlow
Goswin von Brederlow

Reputation: 12342

If all you want is the sum then just compute the sum. No need to store anything:

#include <iostream>
#include <string>
#include <math.h>

int main() {
    int sum = 0;
    for(int i=0; i<100; i++){
        std::cout << "Insert element " << i << ": ";
        int t;
        std::cin >> t;
        sum += t
        std::cout << sum;
    }
}

Upvotes: 1

Vaibhav Vishal Singh
Vaibhav Vishal Singh

Reputation: 123

You can use a do while loop:

#include<iostream>
#include<string>
#include<math.h>

int main()
{
    int array[100];
    int sum=0;
    int i=0;
    std::cout<<"Insert element"<<" "<<i<<": ";
    std::cin>>array[i];
    do
    { 
        sum=sum+array[i];
        std::cout<<sum<<std::endl;
        i++;
        std::cout<<"Insert element"<<" "<<i<<": ";
    }while(std::cin>>array[i]);
    return 0;
}

Upvotes: 1

Jack
Jack

Reputation: 133619

C++ standard library already has a function to do this which is std::accumulate:

#include <iostream>
#include <numeric>

int main() {
    int array[5] = {1,2,3,4,5};
    int total = std::accumulate(std::begin(array), std::end(array), 0);
    return 0;
}

If you plan to use not a full array you should use std::begin(array), std::begin(array) + amount as ranges.

Upvotes: 2

Vinayak
Vinayak

Reputation: 11

initialize your sum var to 0 initially and write sum+=array[i] instead of what you have written, there is also a limitation in this program as value of sum after all user input should be <=10^9 as int datatype store no. approximately upto 10^9 so take note of this fact also. Write cout<<sum<<endl; instead to be able to distinguish till previous input sum to the new input sum. Hope this will help.

Upvotes: 1

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