# C Program to Calculate Average Using Arrays

## Store Numbers and Calculate Average Using Arrays

``````
#include <stdio.h>
int main(){
int n, i;
float num[100], sum = 0.0, avg;

printf("Enter the numbers of elements: ");
scanf("%d", &n);

while (n > 100 || n < 1) {
printf("Error! number should in range of (1 to 100).n");
printf("Enter the number again: ");
scanf("%d", &n);
}

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

avg = sum / n;
printf("Average = %.2f", avg);
return 0;
}
``````

Output

```Enter the numbers of elements: 6
1. Enter number: 45.3
2. Enter number: 67.5
3. Enter number: -45.6
4. Enter number: 20.34
5. Enter number: 33
6. Enter number: 45.6
Average = 27.69
```

Here, the user is first asked to enter the number of elements. This number is assigned to n.

If the user entered integer is greater less than 1 or greater than 100, the user is asked to enter the number again. This is done using a `while` loop.

Then, we have iterated a `for` loop from `i = 0` to `i < n`. In each iteration of the loop, the user is asked to enter numbers to calculate the average. These numbers are stored in the `num[]` array.

``````scanf("%f", &num[i]);
``````

And, the sum of each entered element is computed.

``````sum += num[i];
``````

Once the `for` loop is completed, the average is calculated and printed on the screen.

```