C program to find sum of array elements. To find the sum, the program will use a for loop to retrieve each elements and sum them using expression below.

sum = sum+arr[index]; or sum = sum + arr[index]

**Test case:**

**Input: **int arr[5] = {2,4,6,8,9};

Output: Sum = 29

**Input: **int arr[5] = {2,-4,6,8,9};

Output: Sum = 21

## C program to find sum of array elements

```
/*
* C program to find sum of array elements
*/
#include<stdio.h>
int main(){
int sum =0;
int len = 0;
int index =0;
int arr[5] = {2,4,6,8,9};
len = sizeof(arr)/sizeof(int);//total elements in array
//Run the for loop from index = 0
//to index <len; in given example len is 5
//so loop will be from 0 to 4
for(index = 0; index <len; ++index){
//Retrieve array elements and add
// Below could be written as sum = sum + arr[index];
sum += arr[index];
}
//print sum
printf("Sum: %d ",sum);
return 0;
}
```

Output:

Sum: 29