diff --git a/instructions.c b/instructions.c
index c84f16d..9404525 100644
--- a/instructions.c
+++ b/instructions.c
@@ -16,8 +16,12 @@
 // Return:      instruction_type: R_TYPE or I_TYPE (see structures)
 //
 instruction_type get_type_of_instruction(uint32_t instruct) {
-    // TODO
-    return NULL;
+    if (bit_select(instruct, 26, 32) == 0) {
+        return R_TYPE;
+    } else {
+        return I_TYPE;
+    }
+
 }  // end get_type_of_instruction() function
 
 // ------------------------------------
diff --git a/lab04 b/lab04
new file mode 100755
index 0000000..8f81b49
Binary files /dev/null and b/lab04 differ
diff --git a/lab04.c b/lab04.c
index f71f0d7..6054347 100644
--- a/lab04.c
+++ b/lab04.c
@@ -32,10 +32,12 @@ int main() {
             return EXIT_SUCCESS;
 
         if (get_type_of_instruction(instruct) == R_TYPE) {
+            printf("R_TYPE instruction\n");
             r_instruction* r_instruct = create_r_instruction(instruct);
             execute_r_instruction(r_instruct);
             free(r_instruct);
         } else {  // I_TYPE
+            printf("I_TYPE instruction\n");
             i_instruction* i_instruct = create_i_instruction(instruct);
             execute_i_instruction(i_instruct);
             free(i_instruct);
@@ -58,11 +60,11 @@ int main() {
 
 // ------------------------------------
 // Takes the r_instruction
-// you created in Part 1 and, based on the MIPS instruction, 
-// performs the operation and updates the 'registers' array 
+// you created in Part 1 and, based on the MIPS instruction,
+// performs the operation and updates the 'registers' array
 // (see top of file).
 //
-// Hint: the "func" bits determine the operation (i.e., SLL, 
+// Hint: the "func" bits determine the operation (i.e., SLL,
 // SRA, ADD, SUB, AND, OR).
 //
 // Arguments:   r_instruction structure
@@ -75,11 +77,11 @@ void execute_r_instruction(r_instruction* instruct) {
 
 // ------------------------------------
 // Takes the i_instruction
-// you created in Part 1 and, based on the MIPS instruction, 
-// performs the operation and updates the 'registers' array 
+// you created in Part 1 and, based on the MIPS instruction,
+// performs the operation and updates the 'registers' array
 // (see top of file).
 //
-// Hint: the "opcode" bits determine the operation (.e.,  ADDI, 
+// Hint: the "opcode" bits determine the operation (.e.,  ADDI,
 // ANDI, ORI).
 //
 // Arguments:   i_instruction structure