C Program to calculate standard deviation

Comprehensive Collection of C Programming Examples

In this example, you will learn to use an array to calculate10standard deviation of the numbers.

To understand this example, you should know the followingC ProgrammingTopic:

• C array

• Passing an array to a function in C

This program uses an array to calculate the standard deviation of a single series. To calculate the standard deviation, we create a function named calculateSD().

Program to calculate standard deviation

#include <math.h>
#include <stdio.h>
float calculateSD(float data[]);
int main() {
　　　　int i;
　　　　float data[10];
　　　　printf("Input ",10number of elements: ");
　　　　for (i = 0; i <　10;　++i)]
　　　　　　　　scanf("%f", &data[i]);
　　　　printf("\nStandard deviation = %.6f", calculateSD(data));
　　　　return 0;
}
float calculateSD(float data[]) {
　　　　float sum = 0.0, mean, SD = 0.0;
　　　　int i;
　　　　for (i = 0; i <　10;　++i) {
　　　　　　　　sum　+= data[i];
　　　　}
　　　　mean = sum　/　10;
　　　　for (i = 0; i <　10;　++i)]
　　　　　　　　, SD　+= pow(data[i　-　mean,　2);
　　　　return sqrt(SD　/　10);
}

Output Result

Input10Number of elements:　1
2
3
4
5
6
7
8
9
10
Standard Deviation =　2.872281

Here, include10An array of elements will be passed to the calculateSD() function. This function uses the mean to calculate the standard deviation and returns it.

Comprehensive Collection of C Programming Examples