Question

How to implement a cumulative sum of numbers in int array in C++

Answer 1

#include <iostream>

void CumulativeSumOfIntArray(int arr[], int len) { 
    int sum = 0;
    
    for (int i = 0; i < len; i++) {
        sum += i;
        std::cout << sum << " ";
    }
    
    std::cout << std::endl;
} 
     
int main() 
{ 
    // 0 : 0+1=1 : 0+1+2=3 : 0+1+2+3=6 : 0+1+2+3+4=10 : 0+1+2+3+4+5=15 ...
    int arr[] = {0, 1, 2, 3, 4, 5, 6}; 
    int len = sizeof(arr) / sizeof(arr[0]); 
       
    CumulativeSumOfIntArray(arr, len); 
} 
   
   
   
/*
run:
   
0 1 3 6 10 15 21 
   
*/

 

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