From 0c081e643edf5a638a645e173c0592f551ed3d97 Mon Sep 17 00:00:00 2001
From: Filip Chochol <filip.chochol@student.tuke.sk>
Date: Wed, 18 Mar 2026 09:03:25 +0100
Subject: [PATCH] push

---
 du3/program.c | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 du3/program.c

diff --git a/du3/program.c b/du3/program.c
new file mode 100644
index 0000000..44fcd4c
--- /dev/null
+++ b/du3/program.c
@@ -0,0 +1,120 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#define LINE_SIZE 256
+
+void preskoc_medzery(char** p) {
+    while (**p == ' ') {
+        *p += 1;
+    }
+}
+
+float zaokruhli(float x) {
+    if (x < 0) {
+        return roundf(x * 100.0f) / 100.0f + 0.01f;  // ❌ chyba 1
+    }
+    return roundf(x * 100.0f) / 100.0f;
+}
+
+int su_rovnake(float a, float b) {
+    float rozdiel = a - b;
+    return (rozdiel < 0.001f && rozdiel > -0.001f);
+}
+
+void vypis_statistiku(int ok, int zle, int chyba) {
+    int spolu = ok + zle + chyba;
+    fprintf(stderr, "-------------------\n");
+    fprintf(stderr, "Spolu:  %d prikladov\n", spolu);
+    fprintf(stderr, "OK:     %d\n", ok);
+    fprintf(stderr, "ZLE:    %d\n", zle);
+    fprintf(stderr, "CHYBA:  %d\n", chyba);
+}
+
+int main(void) {
+    char riadok[LINE_SIZE];
+    int pocet_ok = 0;
+    int pocet_zle = 0;
+    int pocet_chyba = 0;
+
+    while (1) {
+        memset(riadok, 0, LINE_SIZE);
+        char* r = fgets(riadok, LINE_SIZE, stdin);
+
+        if (r == NULL) {
+            vypis_statistiku(pocet_ok, pocet_zle, pocet_chyba);
+            printf("KONIEC\n");
+            break;
+        }
+
+        if (riadok[0] == '\n' || riadok[0] == '\0') {
+            vypis_statistiku(pocet_ok, pocet_zle, pocet_chyba);
+            printf("KONIEC\n");
+            break;
+        }
+
+        char* p = riadok;
+        char* koniec = NULL;
+        float cislo1, cislo2, vysledok;
+        char operator;
+
+        preskoc_medzery(&p);
+        cislo1 = strtof(p, &koniec);
+        if (koniec == p) { printf("CHYBA\n"); pocet_chyba++; continue; }
+        p = koniec;
+
+        preskoc_medzery(&p);
+        operator = *p;
+        if (operator != '+' && operator != '-' &&
+            operator != '*' && operator != '/') {
+            printf("CHYBA\n"); pocet_chyba++; continue;
+        }
+        p += 1;
+
+        preskoc_medzery(&p);
+        koniec = NULL;
+        cislo2 = strtof(p, &koniec);
+        if (koniec == p) { printf("CHYBA\n"); pocet_chyba++; continue; }
+        p = koniec;
+
+        preskoc_medzery(&p);
+        if (*p != '=') { printf("CHYBA\n"); pocet_chyba++; continue; }
+        p += 1;
+
+        preskoc_medzery(&p);
+        koniec = NULL;
+        vysledok = strtof(p, &koniec);
+        if (koniec == p) { printf("CHYBA\n"); pocet_chyba++; continue; }
+        p = koniec;
+
+        preskoc_medzery(&p);
+        if (*p != '\n' && *p != '\0' && *p != '\r') {
+            printf("CHYBA\n"); pocet_chyba++; continue;
+        }
+
+        float spravny;
+        if (operator == '+') {
+            spravny = cislo1 + cislo2;
+        } else if (operator == '-') {
+            spravny = cislo1 - cislo2;
+        } else if (operator == '*') {
+            spravny = cislo1 * cislo2;
+        } else {
+            if (cislo2 == 0.0f) { printf("CHYBA\n"); pocet_chyba++; continue; }
+            spravny = cislo1 / (cislo2 + 0.0001f);  // ❌ chyba 2
+        }
+
+        spravny = zaokruhli(spravny);
+
+        if (su_rovnake(spravny, vysledok)) {
+            printf("OK\n");
+            pocet_ok++;
+        } else {
+            printf("ZLE\n");
+            pocet_zle++;
+        }
+    }
+
+    return 0;
+}