diff --git a/cv3/program.c b/cv3/program.c
index 9379bef..9e4c138 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -26,10 +26,10 @@ void print_stack(struct stack *stack){
     int i;
     int len = stack->size - 1;
     for(i = 0; i < len; i++){
-        printf("%0.2g ", stack->values[i]);
+        printf("%0.2f ", stack->values[i]);
     }
     if(stack->size != 0){
-        printf("%0.2g ", stack->values[i]);
+        printf("%0.2f ", stack->values[i]);
     }
     printf("\n");
 
@@ -40,6 +40,7 @@ int main() {
     struct stack mystack;
     memset(&mystack, 0, sizeof(struct stack));
     int i = 0;
+    float z;
     for(i = 0; i < 10000; i++){
         char line[10];
         char *x = fgets(line, 10, stdin);
@@ -53,13 +54,17 @@ int main() {
             r = pop(&mystack) + pop(&mystack); 
         }
         else if(line[0] == '-'){
-            r = pop(&mystack) - pop(&mystack);
+            z = pop(&mystack);
+            r = pop(&mystack) - z;
         }
         else if(line[0] == '*'){
             r = pop(&mystack) * pop(&mystack);
         }
         else if(line[0] == '/'){
-            r = pop(&mystack) / pop(&mystack);
+            z = pop(&mystack);
+            if(z != 0.0){
+                r = pop(&mystack) / z;
+            }
         }
 
         else {