# C++ Program to Calculate Standard Deviation

• Write a C++ program to calculate standard deviation.

In this C++ program, we will calculate standard deviation of N numbers stored in an array. Standard Deviation in statistics is a measure that is used to quantify the amount of variation in a set of data. Its symbol is σ (greek letter sigma) is used to represent standard deviation.

## C++ Program to Calculate Standard Deviation

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

float findStandardDeviation(float *array, int count);

int main() {
int count, i;
float inputArray;

cout << "Enter number of elements\n";
cin >> count;

cout << "Enter " << count <<" elements\n";
for(i = 0; i < count; i++){
cin >> inputArray[i];
}

cout << "Standard Deviation = " << findStandardDeviation(inputArray, count);

return 0;
}
// Function to find standard deviation
float findStandardDeviation(float *array, int count) {
float sum = 0.0, sDeviation = 0.0, mean;
int i;

for(i = 0; i < count; i++) {
sum += array[i];
}
// Calculating mean
mean = sum/count;

for(i = 0; i < count; ++i) {
sDeviation += pow(array[i] - mean, 2);
}

return sqrt(sDeviation/count);
}
```
Output
```Enter number of elements
10
Enter 10 elements
2 4 5 6 8 9 10 13 14 16
Standard Deviation = 4.36005
```

In above program, we first take N numbers as input from user and store it in an integer array "inputArray". Here we have created a function "findStandardDeviation" calculates and return the value of standard.

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