# C++ Program to Calculate Standard Deviation

This program calculates the standard deviation of 10 data using arrays.

To understand this example, you should have the knowledge of the following C++ programming topics:

This program calculates the standard deviation of an individual series using arrays. Visit this page to learn about Standard Deviation.

To calculate the standard deviation, `calculateSD()` function is created. The array containing 10 elements is passed to the function and this function calculates the standard deviation and returns it to the `main()` function.

## Example: Calculate Standard Deviation using Function

``````#include <iostream>
#include <cmath>
using namespace std;

float calculateSD(float data[]);

int main() {
int i;
float data[10];

cout << "Enter 10 elements: ";
for(i = 0; i < 10; ++i) {
cin >> data[i];
}

cout << endl << "Standard Deviation = " << calculateSD(data);

return 0;
}

float calculateSD(float data[]) {
float sum = 0.0, mean, standardDeviation = 0.0;
int i;

for(i = 0; i < 10; ++i) {
sum += data[i];
}

mean = sum / 10;

for(i = 0; i < 10; ++i) {
standardDeviation += pow(data[i] - mean, 2);
}

return sqrt(standardDeviation / 10);
}
``````

Output

```Enter 10 elements: 1
2
3
4
5
6
7
8
9
10

Standard Deviation = 2.87228
```