diff --git a/cv3/program.c b/cv3/program.c
index de4c827..8ec3532 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -1,3 +1,4 @@
+#include <errno.h>
 #include <stdio.h>
 #include <string.h>
 #include <assert.h>
@@ -29,6 +30,12 @@ int main(){
     while(1){
         ptr = fgets(char_value, STACK_SIZE-1, stdin);
         if(ptr != NULL ){
+            if(char_value[0] == '0'){
+                push_stack(&myStack,0);
+                print_stack(&myStack);
+                printf("\n");
+                continue;
+            }
             float_value = strtof(char_value, NULL);
             if(float_value == 0){
                 if(char_value[0] == '+'){
@@ -57,6 +64,10 @@ int main(){
                 } 
                 if(char_value[0] == '/'){
                     float a = pop_stack(&myStack);
+                    if(a == 0){
+                        printf("division by zero\n");
+                        break;
+                    }
                     float b = pop_stack(&myStack);                    
                     float c = b/a;
                     push_stack(&myStack, c);
@@ -65,6 +76,7 @@ int main(){
                 }
  
             }else { 
+                
                 push_stack(&myStack, float_value);
                 print_stack(&myStack);
                 printf("\n");