Day 2

day2/Makefile

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+solution-part%: solution-part%.c
+	gcc $< -o $@
+
+test-%: solution-% example.txt
+	$< example.txt
+
+run-%: solution-% realinput.txt
+	$< realinput.txt
+
+.PHONY: $(patsubst %,run-%, 1 2) $(patsubst %,test-%, 1 2)

day2/example.txt

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+forward 5
+down 5
+forward 8
+up 3
+down 8
+forward 2

day2/solution-part1.c

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+#include <stdio.h>
+#include <string.h>
+
+int main( int argc, char *argv[] ){
+	if( argc == 2 ) {
+
+		unsigned int horizontal = 0;
+		unsigned int depth = 0;
+
+		FILE *fp=fopen(argv[1], "r");
+		while (!feof (fp)){
+			char direction[7] = "";
+			int amount = 0;
+			fscanf(fp, "%s %d\n", direction, &amount);
+
+
+			if ( strcmp(direction,"forward") == 0 )
+				horizontal+=amount;
+			else if ( strcmp(direction,"down") == 0 )
+				depth+=amount;
+			else if ( strcmp(direction,"up") == 0 )
+				depth-=amount;
+			else
+				printf("Hopefully we don't get here\n");
+		
+
+		}
+
+		printf("Horizontal: %d\n", horizontal);
+		printf("Depth: %d\n", depth);
+		printf("Product: %d\n", horizontal * depth);
+		fclose(fp);
+
+
+
+		return 0;
+	} else {
+		printf("You need to provide a file\n");
+		return 1;
+	}
+}

day2/solution-part1.sh

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+#!/usr/bin/env bash
+
+file="$1"
+
+horizontal=0
+depth=0
+
+while read line; do
+	direction="$(echo "$line" | cut -d ' ' -f 1)"
+	amount="$(echo "$line" | cut -d ' ' -f 2)"
+	case "$direction" in
+		forward) horizontal=$((horizontal + amount)) ;;
+		down) depth="$((depth + amount))" ;;
+		up) depth="$((depth - amount))" ;;
+	esac
+done < <(cat "$file")
+
+echo "Horizontal: $horizontal"
+echo "Depth: $depth"
+echo "Product: $(( depth * horizontal ))"

day2/solution-part2.c

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+#include <stdio.h>
+#include <string.h>
+
+int main( int argc, char *argv[] ){
+	if( argc == 2 ) {
+
+		unsigned int horizontal = 0;
+		unsigned int depth = 0;
+		unsigned int aim = 0;
+
+		FILE *fp=fopen(argv[1], "r");
+		while (!feof (fp)){
+			char direction[7] = "";
+			int amount = 0;
+			fscanf(fp, "%s %d\n", direction, &amount);
+
+
+			if ( strcmp(direction,"forward") == 0 ){
+				horizontal+=amount;
+				depth+=(aim*amount);
+			} else if ( strcmp(direction,"down") == 0 )
+				aim+=amount;
+			else if ( strcmp(direction,"up") == 0 )
+				aim-=amount;
+			else
+				printf("Hopefully we don't get here\n");
+		
+
+		}
+
+		printf("Horizontal: %d\n", horizontal);
+		printf("Depth: %d\n", depth);
+		printf("Product: %d\n", horizontal * depth);
+		fclose(fp);
+
+
+
+		return 0;
+	} else {
+		printf("You need to provide a file\n");
+		return 1;
+	}
+}

day2/solution-part2.sh

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+#!/usr/bin/env bash
+
+file="$1"
+
+horizontal=0
+depth=0
+aim=0
+
+while read line; do
+	#direction="$(echo "$line" | cut -d ' ' -f 1)"
+	direction="${line%% *}"
+	#amount="$(echo "$line" | cut -d ' ' -f 2)"
+	amount="${line##* }"
+	case "$direction" in
+		forward)
+			horizontal=$((horizontal + amount))
+			depth="$((depth + (aim * amount) ))"
+			;;
+		down) aim="$((aim + amount))" ;;
+		up) aim="$((aim - amount))" ;;
+	esac
+done < <(cat "$file")
+
+echo "Horizontal: $horizontal"
+echo "Depth: $depth"
+echo "Product: $(( depth * horizontal ))"