Arrays

Calculation of Standard Deviation

#include <stdio.h>
#include <math.h>
#define MAXSIZE 100
void main()
{
int i,n;
float value[MAXSIZE],deviation,sum,sumsqr,mean,variance,stddeviation;
sum=sumsqr=n=0;
printf("Input vaues: input -1 to end\n");
for(i=1;i<MAXSIZE;i++)
{
scanf("%f",&value[i]);
if(value[i]==-1)
break;
sum+=value[i];
n+=1;
}
mean=sum/(float)n;
for(i=1;i<=n;i++)
{
deviation = value[i]-mean;
sumsqr+=deviation*deviation;
}
variance = sumsqr/(float)n;
stddeviation=sqrt(variance);
printf("\nNumber of items: %d\n",n);
printf("Mean : %f\n",mean);
printf("Standard deviation : %f\n",stddeviation);
getch();
}