prumer-cisel.c

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//Povolené knihovny:
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

#include <assert.h> //takto "poresime" chyby

long double prumer (char *format, ...) {
  va_list args;
  char f;
  int i = 0;
  double d;
  long double ld, suma = 0.0L;

  va_start(args, format);
  for (i=0; format[i] ; i++) {
      switch (format[i]) {
      case 'i': suma += va_arg(args, int); break;
      case 'd': suma += va_arg(args, double);      break;
      case 'l': suma += va_arg(args, long double); break;
      default://neznamy format
        assert(("neznamy format",0));
      }
  }
  va_end(args);
  return suma / i;
}

int main (void) {
  long double ld;
  ld = prumer("iii", 1, 2, 3);
  printf("prumer(iii,1,2,3) = %Lg\n", ld);
  printf("prumer(iii,1,2,4) = %Lg\n", prumer("iii", 1,2,4));
  printf("prumer(ddd,1,2,4) = %Lg\n", prumer("ddd", 1,2,4));
  printf("prumer(lll,1,2,4) = %Lg\n", prumer("lll", 1.1L,2.2L,4.4L));//musi byt 1.1L!!!

//pokud by format parametr byl v printf stylu, lze u GNUC pouzit __atributte !!!
  printf("prumer(iii,1,2,?) = %Lg\n", prumer("iii", 1,2));//chybi!!!
  printf("prumer(iiii,1,2,?,?) = %Lg\n", prumer("iiii", 1,2));//chybi!!! => nesmysly!
  printf("prumer(dddd,1,2,?,?) = %Lg\n", prumer("dddd", 1,2));//chybi!!! => nesmysly!

  printf("prumer(x,1,2,?,?) = %Lg\n", prumer("xx", 1,2));//assert abort

  return 0;
}