Course

Introduction

C++ "Hello, World!" Program Print Number Entered by User Add Two Numbers Find Quotient and Remainder Find Size of int, float, double and char in Your System Swap Two Numbers Find ASCII Value of a Character Multiply two Numbers

Functions

Display Prime Numbers Between Two Intervals Using Functions Check Prime Number By Creating a Function Check Whether a Number can be Express as Sum of Two Prime Numbers Find Sum of Natural Numbers using Recursion Calculate Factorial of a Number Using Recursion Find G.C.D Using Recursion Convert Binary Number to Decimal and vice-versa Convert Octal Number to Decimal and vice-versa Convert Binary Number to Octal and vice-versa Reverse a Sentence Using Recursion Calculate Power Using Recursion

Arrays and Strings

Calculate Average of Numbers Using Arrays Find Largest Element of an Array Calculate Standard Deviation Add Two Matrix Using Multi-dimensional Arrays Multiply Two Matrix Using Multi-dimensional Arrays Find Transpose of a Matrix Multiply two Matrices by Passing Matrix to Function Access Elements of an Array Using Pointer Swap Numbers in Cyclic Order Using Call by Reference Find the Frequency of Characters in a String Find the Number of Vowels, Consonants, Digits and White Spaces in a String Remove all Characters in a String Except Alphabets Find the Length of a String Concatenate Two Strings Copy Strings Sort Elements in Lexicographical Order (Dictionary Order)

Structures

Store Information of a Student in a Structure Add Two Distances (in inch-feet) System Using Structures Add Complex Numbers by Passing Structure to a Function Calculate Difference Between Two Time Period Store and Display Information Using Structure

Operator overloading

Increment ++ and Decrement -- Operator Overloading in C++ Programming Subtract Complex Number Using Operator Overloading

C++ Program to Calculate Standard Deviation

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

Also Read:

C++ Program to Calculate Average of Numbers Using Arrays