2verzxia

du2/program.c

@@ -2,11 +2,19 @@
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
+#include <ctype.h>
 
 #define LINE_SIZE 100
+#define MAX_COEFFS 100
 
-int horner(int coeffs[], int n, int x) {
-    int result = coeffs[0];
+int is_valid_number(const char *str) {
+    char *endptr;
+    strtod(str, &endptr);
+    return *endptr == '\0' || isspace(*endptr);
+}
+
+int horner(double coeffs[], int n, double x) {
+    double result = coeffs[0];
     for (int i = 1; i < n; i++) {
         result = result * x + coeffs[i];
     }
@@ -15,25 +23,25 @@ int horner(int coeffs[], int n, int x) {
 
 int main() {
     char line[LINE_SIZE];
-    memset(line, 0, LINE_SIZE);
-    
-    char* r = fgets(line, LINE_SIZE, stdin);
-    assert(r != NULL);
-    
-    char* endptr = NULL;
-    int x = strtol(line, &endptr, 10);
-    
-    if (endptr == line) {
-        fprintf(stderr, "Error: Invalid input.\n");
+    double coeffs[MAX_COEFFS];
+    int n = 0;
+
+    if (fgets(line, LINE_SIZE, stdin) == NULL || !is_valid_number(line)) {
+        fprintf(stderr, "Error: Invalid input for x.\n");
         exit(EXIT_FAILURE);
     }
-    
-    int coeffs[] = {2, 3, 4};
-    int n = sizeof(coeffs) / sizeof(coeffs[0]);
-    
-    int result = horner(coeffs, n, x);
-    
-    printf("The result of the polynomial evaluation is: %d\n", result);
-    
+    double x = strtod(line, NULL);
+
+    while (fgets(line, LINE_SIZE, stdin) != NULL && line[0] != '\n') {
+        if (!is_valid_number(line)) {
+            fprintf(stderr, "Error: Invalid input for coefficient %d.\n", n + 1);
+            exit(EXIT_FAILURE);
+        }
+        coeffs[n++] = strtod(line, NULL);
+    }
+
+    double result = horner(coeffs, n, x);
+    printf("Vysledok je: %.2f\n", result);
+
     return 0;
 }