77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
//
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// Created by Lennart on 02/12/2023.
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//
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include "input_handler.h"
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int find_digits(FILE *f, bool replace_letters);
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int solve(const char *fileName, bool replace_letters);
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char *buffer;
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int bufferLen;
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const char* digitsAsLetters[] = {
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"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"
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};
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int main() {
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printf("Result #1: %i\n", solve("day_1.txt", false));
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printf("Result #2: %i\n", solve("day_1.txt", true));
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free(buffer);
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return 0;
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}
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int solve(const char *fileName, bool replace_letters) {
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FILE *f = fopen(fileName, "r");
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if(f == NULL) {
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printf("Error! Missing input file!");
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exit(-1);
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}
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int sum = 0;
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while(!feof(f)) {
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sum += find_digits(f, replace_letters);
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}
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fclose(f);
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return sum;
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}
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// Read all digits form the next line in a file
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int find_digits(FILE *f, bool replace_letters) {
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int first = -1, last = 10; // Use first=-1 to detect unset value and last=10 to return 0 (-10 + 10) when no values are set
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// Read the entire line as a string
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read_line(f, &buffer, &bufferLen);
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for(int i = 0; i < bufferLen; i++) {
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if(buffer[i] == 0) {
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break;
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}
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int digit = -1;
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if(sscanf(&buffer[i], "%1d", &digit) != 1 && replace_letters) {
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for(int j = 1; j < 10; j++) {
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if(strncmp(&buffer[i], digitsAsLetters[j], strlen(digitsAsLetters[j])) == 0) {
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digit = j;
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break;
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}
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}
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}
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if(digit >= 0) {
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if(first == -1) {
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first = digit;
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}
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last = digit;
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}
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}
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return first * 10 + last;
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}
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