C Program to Calculate Standard Deviation Using Function

#include <math.h>
#define MAXSIZE 100
main( ) {
   int i,n;
   float value [MAXSIZE], deviation,
   sum,sumsqr,mean,variance,stddeviation;
   sum = sumsqr = n = 0 ;
   printf("Input values: 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);
}