#include <stdio.h>#define MAX 1024main(){      float x[MAX];      float var2, var3, var4 ;      float var5, var1;      float t1, t2;      float ssq;      float avg;      float dev;      int  i, n;         t2 = 0 ;         t1 = 0 ;         ssq = 0 ;         dev = 0;         scanf ("%d", &n);         for ( i = 0 ; i < n ; i = i + 1)         {           scanf ("%f", &x[i]);           t1 = t1 + x[i];           ssq = ssq + x[i] * x[i];          }         avg = t1 / n;         var3 = (ssq  - n * avg * avg) / (n - 1);         var4 = (ssq  - t1 * avg) / (n - 1);         t1 = t1 * t1 / n;         var2 = (ssq  -  t1 ) / (n - 1);         t1 = 0 ;         for ( i = 0 ; i < n ; i = i + 1)         {           dev = x[i] - avg ;           t2 = t2 + dev ;           t1 = t1 + dev * dev ;         }         var5 = (t1 - t2 * t2 / n ) / (n -1);         var1 = t1 / (n - 1);          printf("variance (one pass, using square of sum): %f \n",var2);          printf("variance (one pass, using average): %f \n",var3);          printf("variance (one pass, using average, sum): %f \n",var4);          printf("variance (two pass, corrected): %f \n",var5);          printf("variance (two pass): %f \n",var1);}