90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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int je_cislo(const char *str) {
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char *endptr;
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strtod(str, &endptr);
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return *endptr == '\0';
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}
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double citaj_cislo(int poradie, int *chyba) {
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char buffer[100];
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if (fgets(buffer, sizeof(buffer), stdin) == NULL) {
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if (poradie == 0) {
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printf("Nepodarilo sa nacitat hodnotu x.\n");
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} else {
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printf("Nepodarilo sa nacitat polynom na %d mieste.\n", poradie);
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}
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*chyba = 1;
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return NAN;
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}
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char *newline = strchr(buffer, '\n');
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if (newline) *newline = '\0';
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if (buffer[0] == '\0') {
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return NAN;
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}
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if (!je_cislo(buffer)) {
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if (poradie == 0) {
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printf("Nepodarilo sa nacitat hodnotu x.\n");
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} else {
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printf("Nepodarilo sa nacitat polynom na %d mieste.\n", poradie);
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}
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*chyba = 1;
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return NAN;
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}
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return atof(buffer);
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}
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double hornerova_schema(double *koef, int n, double x) {
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double vysledok = 0.0;
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for (int i = 0; i < n; i++) {
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vysledok = vysledok * x + koef[i];
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}
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return vysledok;
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}
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int main() {
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double x;
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double koef[100];
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int n = 0;
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int chyba = 0;
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x = citaj_cislo(0, &chyba);
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if (chyba) return 0;
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while (1) {
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double koeficient = citaj_cislo(n + 1, &chyba);
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if (chyba) return 0;
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if (isnan(koeficient)) break;
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koef[n++] = koeficient;
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if (n >= 100) {
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printf("Chyba: Prilis vela koeficientov.\n");
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return 0;
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}
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}
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if (n == 0) {
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printf("Chyba: Neboli zadane ziadne koeficienty.\n");
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return 0;
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}
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double vysledok = hornerova_schema(koef, n, x);
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printf("Vysledok je: %.2f\n", vysledok);
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return 0;
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}
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