# C Exercises: Calculate and print average of the stream of given numbers

## C Programming Mathematics: Exercise-21 with Solution

Write a C program to calculate and print the average (or mean) of a stream of given numbers.

Example 1:

Input:

arr[] = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100}

Output:

Average of 1 numbers is 10.000000

Average of 2 numbers is 15.000000

Average of 3 numbers is 20.000000

Average of 4 numbers is 25.000000

Average of 5 numbers is 30.000000

Average of 6 numbers is 35.000000

Average of 7 numbers is 40.000000

Average of 8 numbers is 45.000000

Average of 9 numbers is 50.000000

Average of 10 numbers is 55.000000

**Pictorial Presentation:**

**Sample Solution:**

**C Code:**

```
#include <stdio.h>
#include <stdlib.h>
void streamAvg(float arr[], int arr_size)
{
float avg = 0;
int i = 0;
while(i<arr_size)
{
avg = (avg * i + arr[i]) / (i + 1);
printf("\nAverage of %d numbers is %f \n", i + 1, avg);
i++;
}
return;
}
int main(void)
{
float arr[] = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100};
int arr_size = sizeof(arr) / sizeof(arr[0]);
printf("\nElements in array are: ");
int i=0;
while(i<10)
{
printf("%f ", arr[i]);
i++;
}
streamAvg(arr, arr_size);
return 0;
}
```

Sample Output:

Elements in array are: 10.000000 20.000000 30.000000 40.000000 50.000000 60.000000 70.000000 80.000000 90.000000 100.000000 Average of 1 numbers is 10.000000 Average of 2 numbers is 15.000000 Average of 3 numbers is 20.000000 Average of 4 numbers is 25.000000 Average of 5 numbers is 30.000000 Average of 6 numbers is 35.000000 Average of 7 numbers is 40.000000 Average of 8 numbers is 45.000000 Average of 9 numbers is 50.000000 Average of 10 numbers is 55.000000

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**C Programming Code Editor:**

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