C Program to Calculate Standard Deviation

Standard Deviation (SD) is a quantity expressing by how much the members of a group differ from the mean value for the group. Its formula is 

#include <stdio.h>

#include <conio.h>

#include <stdlib.h> /*for DMA*/

#include <math.h>

void main()

{

    int n,i;

    float *x,sum=0,mean,add_deviation=0;

    printf("Enter how many records are there?: ");

    scanf("%d",&n);

    x=(float*)calloc(n,sizeof(float));

    if(x==NULL)

        printf("Hey! Memory not allocated.");

    printf("Enter data:\n");

    for(i=0;i<n;i++)

    {

        scanf("%f",x+i);

        sum+=*(x+i);

    }

    mean=sum/n;

    printf("\nMean = %f\n",mean);

    for(i=0;i<n;i++)
        add_deviation+=(*(x+i)-mean)*(*(x+i)-mean);
    printf("\nStandard Deviation (SD) = %f",sqrt(add_deviation/n));

    free(x);

    getch();

}

OUTPUT:

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