first commit

2015_day_1/Makefile

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+compile:
+	gcc initialprog.c -Werror=switch -o initialprog

2015_day_1/README

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+Advent of Code 2015 Day 1
+Completed 10/2/2025
+It may be that Verilog state machines followed me home to do this
+I need to set up some tests on it still
+Reference on makefiles: https://makefiletutorial.com/

2015_day_1/initialprog.c

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+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+FILE *fptr;
+char line1[10000];
+int floor_number;
+enum states{
+  START,
+  PROCESS,
+  END,
+} state;
+
+enum events{
+  START_LOOP,
+  INCREMENT,
+  DECREMENT,
+  STOP_LOOP,
+  ERROR_EVENT
+};
+
+void step_state(enum events event){
+  switch(state){
+    case START:
+      switch(event){
+        case START_LOOP:
+          state = PROCESS;
+          break;
+        default:
+          exit(1);
+          break;
+      }
+      break;
+    case PROCESS:
+      switch(event){
+        case INCREMENT:
+          floor_number++;
+          break;
+        case DECREMENT:
+          floor_number--;    
+          break;
+        case STOP_LOOP:
+          state = END;
+          break;  
+        case ERROR_EVENT:
+          printf("ERROR!");
+          exit(1);
+          break;
+        default:
+          exit(1);
+          break;
+      }
+
+  }
+}
+
+int main()
+{
+floor_number = 0;
+fptr = fopen("2015_day_1_input.txt", "r");  
+if(fptr == NULL) {
+  printf("Not able to open the file.");
+}
+fgets(line1, 10000, fptr);
+fclose(fptr);
+step_state(START_LOOP);
+size_t i = 0;
+while (line1[i] != '\0'){
+  if (line1[i] == '('){
+    step_state(INCREMENT);
+  }
+  else if (line1[i] == ')'){
+    step_state(DECREMENT);
+  }
+  else{
+    printf("\nCharacter not ( or ), ERROR!");
+    exit(1);
+  }
+  i++;
+}
+
+printf("\nThe Floor number is: %d\n\n", floor_number);
+return 0;
+}
+
+
+//Sources:
+//https://dev.to/zirkelc/how-to-iterate-over-c-string-lcj#:~:text=Pointer-,For%2DLoop,each%20iteration%20with%20*%2B%2Bp%20.
+//https://yakking.branchable.com/posts/state-machines-in-c/