Question

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

Answer 1

#include <stdio.h>
 
void CumulativeSumOfIntArray(int arr[], int len) { 
    int sum = 0;
    for (int i = 0; i < len; i++) {
        sum += i;
        printf("%3d", sum);
    }
    
    printf("\n");
} 
     
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); 
       
    return 0; 
} 
   
   
   
/*
run:
   
  0  1  3  6 10 15 21
   
*/

 

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