rozpoznani-znaku.c

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

int main() {
  char c;

  if (printf("Zadejte znak: "), 1==scanf("%c", &c)) {
     if      ('0' <= c && c <= '9') {
        printf("cislice %c\n", c);
     }
     else if ('a' <= c && c <= 'z') {
        printf("male pismeno %c\n", c);
     }
     else if ('A' <= c && c <= 'Z') {
        printf("velke pismeno %c\n", c);
     }
     else {
        switch (c) {
        case '!': printf("vykricnik, bang\n");break;
        case '?': printf("otaznik\n");break;
        case '*': printf("hvezdicka\n");break;
        case '@': printf("zavinac\n");break;
        case '#': printf("krizek, hash, zahradka\n");break;
        case '^': printf("striska\n");break;
        }
     }
     return EXIT_SUCCESS;
  }

  fprintf(stderr, "Zadejte znak!\n");
  return EXIT_FAILURE;
}