diff --git a/cv3/program.c b/cv3/program.c
index e677b5a..22dc251 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -17,7 +17,6 @@ void push_stack(struct stack* stack, float value);
 float pop_stack(struct stack* stack);
 
 
-
 int main(){
     
 
@@ -43,27 +42,34 @@ int main(){
             }*/
  
             if(char_value[0] == '+'){
+                    if(myStack.size > 1){
                     float a = pop_stack(&myStack);
                     float b = pop_stack(&myStack);                    
                     float c = a+b;
                     push_stack(&myStack, c);
                     print_stack(&myStack);
                     printf("\n");
+                    }else{puts("not enough operands"); break;}
             }else if(char_value[0] == '-'){
+                    if(myStack.size > 1){
                     float a = pop_stack(&myStack);
                     float b = pop_stack(&myStack);                    
                     float c = b-a;
                     push_stack(&myStack, c);
                     print_stack(&myStack);
                     printf("\n");
+                    }else{puts("not enough operands"); break;}
                 }else if(char_value[0] == '*'){
+                    if(myStack.size > 1){
                     float a = pop_stack(&myStack);
                     float b = pop_stack(&myStack);                    
                     float c = a*b;
                     push_stack(&myStack, c);
                     print_stack(&myStack);
                     printf("\n");
+                    }else{puts("not enough operands"); break;}
                 } else if(char_value[0] == '/'){
+                    if(myStack.size > 1){
                     float a = pop_stack(&myStack);
                     if(a == 0){
                         printf("division by zero\n");
@@ -75,6 +81,7 @@ int main(){
                         print_stack(&myStack);
                         printf("\n");
                     }
+                    }else{puts("not enough operands"); break;}
                 } else if(isdigit(char_value[0]) != 0 ){
                     float_value = strtof(char_value, NULL);
                     //printf("float value: %f\n",float_value);
@@ -122,3 +129,4 @@ float pop_stack(struct stack* stack){
     stack->size -= 1;
     return value;
 }
+