Infinite loop when calling the stack print function

This program should takes a postfix arithmetic expression then compiles the values of that expression.. Each time an integer is read, its gonna get pushed into the stack.. Otherwise, Two integers would be popped if +,-,* is read.

class Stack { 
      Node *head; 
      
      public: Stack() { 
          head = NULL; 
          }; 
          
      void push(int data); 
      int pop(); 
      bool isEmpty();
      void print();
      }; 
      
      void Stack::push(int data) 
      {
        Node * temp = new Node(data);
        temp->next=head;
        head=temp;
        delete temp;
      }
                      
      int Stack::pop() 
      { 
        int x=head->data;
        head=head->next;
        return x;
      }
      
      bool Stack::isEmpty(){
         return head==NULL;  
     } 
     
     void Stack::print(){
        Node * temp = head;
        while(temp!=NULL){
                cout << temp->data << " ";
                temp=temp->next;
                 }
                 delete temp;
         }
      

int main() { 
    
    Stack st;
    char exp[]="23+",c;
    int i,a;
    
    for(i=0;exp[i]!='\0';i++){
        c=exp[i];
                
                if(c=='+'&&!st.isEmpty()){
                    a= st.pop() + st.pop();
                    st.push(a);
            }
                else if(c=='-'&&!st.isEmpty()){
                        a= st.pop() - st.pop();
                    st.push(a);
                }
                else if(c=='/'&&!st.isEmpty()){
                        a= st.pop() / st.pop();
                    st.push(a);
                }
                else if(c=='*'&&!st.isEmpty()){
                        a= st.pop() * st.pop();
                    st.push(a);
                }
                else if(c=='0')
                    st.push(0);
                    else if(c=='1')
                       st.push(1);
                       else if(c=='2')
                          st.push(2);
                          else if(c=='3')
                            st.push(3);
                            else if(c=='4')
                               st.push(4);
                               else if(c=='5')
                                  st.push(5);
                                   else if(c=='6')
                                      st.push(6);
                                      else if(c=='7')
                                         st.push(7);
                                          else if(c=='8')
                                             st.push(8);
                                            else if(c=='9')
                                               st.push(9);
                
                cout << c << endl;
                st.print();
        }

    cin >> a;
    return 0;
    
}

When I call the print function in main, I get an infinite loop as an output.. I tried looking for the thing that's causing an infinite loop but I couldn't find it.