prace-s-promennymi.c

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

#include <limits.h>//nepovolenej, ale co se da delat

int    cislo = 3;
double des_cislo = 3.45;
char   muj_znak  = '+';
double male_cislo = 1.2e-10;

         char  ch  = 'c';//-128..127
unsigned char uch  = '\xa1';//0..255
         short  s  = 12345; // -32768..32767
unsigned short us  = 65535;
         int    i  = 0xBABABEBE; //32bitu na ILP32, LP64 platforme
unsigned int   ui  = 0xB1aaB1ee;
         long   l  = 12345; //64bitu na LP64, 32bit na ILP32
unsigned long  ul  = 65535;
//explicitni velikosti viz stdint.h

     float  flout = 22.0/7;//C stejne pocita s float jako s double!
     double  dabl = 22.0/7;
long double ldabl = 22.0/7;

size_t sz;

int main(void) {
  printf("Hodnota promenne cislo je: %i\n", i);
  printf("Hodnota promenne des_cislo je: %3.2f\n", des_cislo);
  printf("Hodnota promenne muj_znak je: %c\n", muj_znak);
  printf("Hodnota promenne male_cislo je: %g\n", male_cislo);

//dalsi zajimave pokusy
//locale pro kompilaci je utf-8!!! \xa1 je neplatne utf!
//pro 8bitove locale je \xa1 zaporne cislo, char je default signed!
  ch = '\xa1';
  ch = 'á';//dlouhe a
  printf(" ch: '%c' \\x%x\n",  ch, ch);
  printf("uch: '%c' \\x%x\n", uch,uch);

  printf(" i %%i: %i\n", i);
  printf("ui %%i: %i\n",ui);
  printf("ui %%u: %u\n",ui);
  printf("LONG_MAX=%li\n", LONG_MAX);
  printf(" INT_MAX=%i\n",  INT_MAX);

  printf("flout  %%g: %g,  %%e: %e,  %%f: %f,  %%60.58f: %60.58f\n", flout, flout, flout, flout);
  printf(" dabl  %%g: %g,  %%e: %e,  %%f: %f,  %%60.58f: %60.58f\n",  dabl,  dabl,  dabl,  dabl);
//long double potrebuje %Lf apod!!!
  printf("ldabl %%Lg: %Lg, %%Le: %Le, %%Lf: %Lf, %%60.58Lf: %60.58Lf\n", ldabl, ldabl, ldabl, ldabl);

//note: zmena na 32bit long pomoci -m32
#define SIZEOF(type) printf("sizeof(" #type ")==%zu\n",sizeof(type))
  SIZEOF(char);
  SIZEOF(short);
  SIZEOF(int);
  SIZEOF(long);
  SIZEOF(double);
  SIZEOF(long double);
  SIZEOF(char *);

  return EXIT_SUCCESS;
}