75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#define LINE_SIZE 100
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// Function to safely read a double value
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int read_double(double *value, int coef_index) {
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char line[LINE_SIZE];
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if (fgets(line, LINE_SIZE, stdin) == NULL) {
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return 0; // Error while reading
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}
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// Remove the newline character
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line[strcspn(line, "\r\n")] = 0;
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// Check if the line is empty
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if (strlen(line) == 0) {
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return 0;
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}
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char *endptr;
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*value = strtod(line, &endptr);
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// If no number was read or there are invalid characters
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if (endptr == line || *endptr != '\0') {
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printf("Nepodarilo sa nacitat polynom na %d mieste.\n", coef_index); // Correct error message
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return -1; // Indicate error
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}
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return 1;
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}
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int main() {
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double x;
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// Read the value of x with special error message for invalid input
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int status = read_double(&x, 1);
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if (status == -1) {
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printf("Nepodarilo sa nacitat zaklad x\n");
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return 1;
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}
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if (status == 0) {
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return 1; // Exit if no input is provided
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}
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double coef;
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double result = 0;
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int coef_count = 1; // Start from the first coefficient (x^1)
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// Loop to read coefficients
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while (1) {
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status = read_double(&coef, coef_count + 1); // coef_count + 1 for correct indexing
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if (status == -1) {
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return 0; // Exit program if there's invalid input
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}
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if (status == 0) {
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if (coef_count == 1) { // If no coefficient is provided for x^0
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return 1;
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}
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break;
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}
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result = result * x + coef; // Apply Horner's method for polynomial evaluation
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coef_count++;
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}
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// Print the result
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printf("Vysledok je: %.2f\n", result);
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return 0;
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} |