# C Program to Calculate Sum & Average of an Array

## Method 1

``````#include <stdio.h>

int main()
{
int Arr[100], n, i, sum = 0;

printf("Enter the number of elements you want to insert : ");
scanf("%d", &n);

for (i = 0; i < n; i++)
{
printf("Enter element %d : ", i + 1);
scanf("%d", &Arr[i]);
sum += Arr[i];
}

printf("\nThe sum of the array is : %d", sum);
printf("\nThe average of the array is : %0.2f", (float)sum / n);

return 0;
}```

```

## Output

``````Enter the number of elements you want to insert : 6
Enter element 1 : 10
Enter element 2 : 20
Enter element 3 : 15
Enter element 4 : 18
Enter element 5 : 21
Enter element 6 : 19

The sum of the array is : 103
The average of the array is : 17.17
``````

## Method 2

``````#include  <stdio.h>

#define MAXSIZE 10

void main()

{
int array[MAXSIZE];

int i, num, negative_sum = 0, positive_sum = 0;

float total = 0.0, average;

printf ("Enter the value of N \n");

scanf("%d", &num);

printf("Enter %d numbers (-ve, +ve and zero) \n", num);

for (i = 0; i < num; i++)

{

scanf("%d", &array[i]);

}

printf("Input array elements \n");

for (i = 0; i < num; i++)

{

printf("%+3d\n", array[i]);

}

for (i = 0; i < num; i++)

{
if (array[i] < 0)

{

negative_sum = negative_sum + array[i];

}

else if (array[i] > 0)

{

positive_sum = positive_sum + array[i];

}

else if (array[i] == 0)
{
;
}

total = total + array[i] ;
}

average = total / num;

printf("\n Sum of all negative numbers =  %d\n", negative_sum);

printf("Sum of all positive numbers =  %d\n", positive_sum);

printf("\n Average of all input numbers =  %.2f\n", average);

}

``````

## Output

``````Enter the value of N
10
Enter 10 numbers (-ve, +ve and zero)
-8
9
-100
-80
90
45
-23
-1
0
16
Input array elements
-8
+9
-100
-80
+90
+45
-23
-1
+0
+16

Sum of all negative numbers =  -212
Sum of all positive numbers =  160

Average of all input numbers =  -5.20``````