This program calculates the average of marks if the data are from 1 to 100. If user enters value of n above 100 or below 1 then, while loop is executed which asks user to enter value of n until it is between 1 and 100. When the numbers are entered by the user, subsequently the sum is calculated and stored in the variable sum. After storing all the numbers, average is calculated and displayed.

#### Example: Look at these numbers:

*3, 7, 5, 13, 20, 23, 39, 23, 40, 23, 14, 12, 56, 23, 29*

The sum of these numbers is 330

There are fifteen numbers.

The mean is equal to 330 / 15 = 22

The mean of the above numbers is 22

### C++ Program to Calculate Average of Numbers Using Arrays

For loop is started from 0 to n-1. This loop adds all the elements of the array. The code snippet demonstrating this is as follows.for(i = 0; i < n; i++)The average of the numbers is obtained by dividing the sum by n i.e amount of numbers. This is shown below

sum += num[i];

average= sum / n;Finally the average is displayed.

#### Output

Enter the numbers of data: 5

1. Enter number: 125

Error! number should in range of (1 to 100).

Enter the number again: 100.0

2. Enter number: 75.0

3. Enter number: 65.0

4. Enter number: 65.36

5. Enter number: 75.98

Average = 76.268

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