akumulator.c

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#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

double soucet (double a, double b) { return a + b; }

double soucin (double a, double b) { return a * b; }

double akumulator(double (*fce)(double, double), double cisla[], int pocet) {
  double acc;
  int i;

  assert(pocet>0);
  acc = cisla[0];//nemame init argument jako foldl
  for (i=1; i<pocet; i++) {
//printf("acc=%g cisla[%d]=%g\n", acc, i, cisla[i]);//ladeni
      acc = (*fce)(acc, cisla[i]);
  }
  return acc;
}

#define PNELEM 10
int main(void) {
   double p[PNELEM];//vetsi/velka pole radeji jako static, ne na zasobniku
   int i;

   for (i=0; i<PNELEM; i++)
      p[i] = i+1;

   printf("Suma    je: %g\n", akumulator(soucet,p,PNELEM));
   printf("Produkt je: %g\n", akumulator(soucin,p,PNELEM));

   return 0;
}