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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int pos = 0;
int depth = 0;
int aim = 0;
void ParseInput(char *filepath)
{
char ch;
FILE *fp;
fp = fopen(filepath, "r");
if (fp == NULL)
{
perror("Error while opening the file.\n");
exit(EXIT_FAILURE);
}
char command;
char char_x_val;
int current_type = 0; // 0 - command; 1 - skip; 2 - val
/* Part 1
while((ch= fgetc(fp)) != EOF)
{
if(ch == ' ')
{
current_type = 2;
}
else if(ch == '\n')
{
int x = atoi(&char_x_val);
switch(command)
{
case 'f':
pos += x;
break;
case 'd':
depth += x;
break;
case 'u':
depth -= x;
}
current_type = 0;
}
else if(current_type == 0)
{
command = ch;
current_type = 1;
}
else if(current_type == 2)
{
char_x_val = ch;
}
}
*/
/* Part2 */
while((ch= fgetc(fp)) != EOF)
{
if(ch == ' ')
{
current_type = 2;
}
else if(ch == '\n')
{
int x = atoi(&char_x_val);
switch(command)
{
case 'f':
pos += x;
depth += aim * x;
break;
case 'd':
aim += x;
break;
case 'u':
aim -= x;
}
current_type = 0;
}
else if(current_type == 0)
{
command = ch;
current_type = 1;
}
else if(current_type == 2)
{
char_x_val = ch;
}
}
fclose(fp);
}
int main(void)
{
ParseInput("input-2.txt");
printf("pos: %d, depth: %d; product: %d", pos, depth, pos * depth);
return 0;
}
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