diff --git a/du3/program.c b/du3/program.c
index bfff09b..e57f4d0 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -47,10 +47,17 @@ void process_operations(struct stack* stack) {
             if (stack->size >= 2) {
                 float b = pop_stack(stack);
                 float a = pop_stack(stack);
+                if (line[0] == '/' && b == 0.0F)
+                {
+                    printf("division by zero\n");
+                    return;
+                }
+                
                 float res = (line[0] == '+') ? a + b :
                             (line[0] == '-') ? a - b :
                             (line[0] == '*') ? a * b :
                             (line[0] == '/') ? a / b : 0;
+
                 push_stack(stack, res);
                 print_stack(stack);
             } else {