completed part 2

2015_day_1/Makefile

@@ -1,2 +1,5 @@
 compile:
 	gcc initialprog.c -Werror=switch -o initialprog
+
+run:
+	./initialprog

2015_day_1/initialprog.c

@@ -4,17 +4,17 @@
 FILE *fptr;
 char line1[10000];
 int floor_number;
+int flag_a;
+int char_zero_cross;
 enum states{
   START,
   PROCESS,
-  END,
 } state;
 
 enum events{
   START_LOOP,
   INCREMENT,
   DECREMENT,
-  STOP_LOOP,
   ERROR_EVENT
 };
 
@@ -38,11 +38,8 @@ void step_state(enum events event){
         case DECREMENT:
           floor_number--;    
           break; 
-        case STOP_LOOP:
-          state = END;
-          break;  
         case ERROR_EVENT:
-          printf("ERROR!");
+          printf("ERROR!\n");
           exit(1);
           break;
         default:
@@ -55,6 +52,7 @@ void step_state(enum events event){
 
 int main()
 {
+flag_a = 0;
 floor_number = 0;
 fptr = fopen("2015_day_1_input.txt", "r");  
 if(fptr == NULL) {
@@ -76,6 +74,10 @@ while (line1[i] != '\0'){
     exit(1);
   }
   i++;
+  if (floor_number < 0 && flag_a == 0){
+    printf("first zero-crossing is at position %lu\n", i);
+    flag_a = 1;
+  }
 }
 
 printf("\nThe Floor number is: %d\n\n", floor_number);