#include <stdio.h>
main () {
  int n, i, j;
  double x, f, g, a, ai, xmin, xmax, dx;
  printf ("a? "); scanf ("%lf", &a);
  printf ("n? "); scanf ("%d", &n);
  printf ("xmin, xmax, dx? ");
  scanf ("%lf%lf%lf", &xmin, &xmax, &dx);
  printf ("\n     x            f(x)\n"
          "========================\n");
  for (x=xmin; x<=xmax; x+=dx) {
    for (ai=1, f=i=0; i<=n; i++) {
      for (g=1, j=0; j<n; j++)
        if (j != i)
          g *= (x+i)*(x-j)/abs(i-j);
      f += ai * g;
      ai *= a;
    }
    printf ("%12.2f%12.2f\n", x, f);
  }
}

#include <stdio.h>
#include <ctype.h>
main () {
  int zn, ukupno=0, broj=0;
  while ((zn = getchar()) != EOF)
    if (zn>='0' && zn<='7') {
      broj = broj * 8 + (zn - '0');;
    } else {
      ukupno += broj; broj = 0;
    }
  ukupno += broj;
  printf ("Zbir brojeva: %o\n", ukupno);
}

#include <stdio.h>
#include <stdlib.h>
main () {
  while (1) {
    float *a; int n, i, j;
    unsigned long b, m;
    printf ("\nn? "); scanf ("%d", &n);
  if (n <= 0 || n > 32) break;
    a = malloc (n * sizeof (int));
    printf ("A? ");
    for (i=0; i<n; scanf("%d", &a[i++]);
    printf ("Niz bitova (hex) ? ");
    scanf ("%lx", &b);
    for(m=1UL<<n-1,i=j=0; i<n; m>>=1,i++)
      if (b & m) a[j++] = a[i];
    a = realloc (a, (n=j)*sizeof(float));
    printf ("A=");
    for (i=0;i<n;printf(" %.2f",a[i++]));
    putchar ('\n');
    free (a);
  }
}