diff --git a/src/assemblylineconversion.c b/src/assemblylineconversion.c
new file mode 100644
index 0000000..f612329
--- /dev/null
+++ b/src/assemblylineconversion.c
@@ -0,0 +1,3 @@
+#include <stdio.h>
+#include <string.h>
+
diff --git a/src/assemblylineconversion.h b/src/assemblylineconversion.h
new file mode 100644
index 0000000..e69de29
diff --git a/src/fileaccess.c b/src/fileaccess.c
index 3ee3831..621de3c 100644
--- a/src/fileaccess.c
+++ b/src/fileaccess.c
@@ -3,6 +3,7 @@
 
 #define MAX_ASM_LINE_LENGTH 100
 
+//validates inputted charlist as valid filename against expected extension
 int isValidFileFormat(char filename[], char expectedExtension[]){
     int *pointLoc = strrchr(filename, '.');
 
@@ -14,10 +15,11 @@ int isValidFileFormat(char filename[], char expectedExtension[]){
     return(0);
 }
 
+//writes a list of words (list of binary instructions) to a named output file
 int writeBinaryFile(word instrs[], char outputFile[]){
 
     if (!isValidFileFormat(filename, "bin")){
-        return(-1);
+        exit(EXIT_FAILURE);
     }
 
     FILE *fp; 
@@ -25,18 +27,20 @@ int writeBinaryFile(word instrs[], char outputFile[]){
     fp = fopen(outputFile, "wb");
 
     if(fp == NULL){
-        return(-1);
+        exit(EXIT_FAILURE);
     }
 
-    fwrite(instrs, 4, sizeof(instrs), fp);
+    fwrite(instrs, sizeof(word), sizeof(instrs), fp);
     fclose(fp);
 
-    return(0);
+    exit(EXIT_SUCCESS);
 }
 
+
+//reads assembly file of "inputFile" name, 
 int readAssemblyFile(char inputFile[]) {
     if (!isValidFileFormat(filename, "s")){
-        return(1);
+        exit(EXIT_FAILURE);
     }
 
     FILE *fp;
@@ -45,12 +49,12 @@ int readAssemblyFile(char inputFile[]) {
     fp = fopen(inputFile, "r");
 
     if(fp == NULL){
-        return(-1);
+        exit(EXIT_FAILURE);
     }
     
     while (fgets(savedLine, MAX_ASM_LINE_LENGTH-1, fp) != NULL) {
         //pass line to parser
     }
 
-    return(0);
+    exit(EXIT_SUCCESS);
 }
\ No newline at end of file