text: #include <stdio.h>   
  int stack[100],i,j,choice=0,n,top=-1;  
  void push();  
  void pop();  
  void show();  
  void main ()  
  {  
        
      printf("Enter the number of elements in the stack ");   
      scanf("%d",&n);  
      printf("*********Stack operations using array*********");  
    
  
      while(choice != 4)  
      {  
          printf("Chose one from the below options...\n");  
          printf("\n1.Push\n2.Pop\n3.Show\n4.Exit");  
          printf("\n Enter your choice \n");        
          scanf("%d",&choice);  
          switch(choice)  
          {  
              case 1:  
              {   
                  push();  
                  break;  
              }  
              case 2:  
              {  
                  pop();  
                  break;  
              }  
              case 3:  
              {  
                  show();  
                  break;  
              }  
              case 4:   
              {  
                  printf("Exiting....");  
                  break;   
              }  
              default:  
              {  
                  printf("Please Enter valid choice ");  
              }   
          };  
      }  
  }   
    
  void push ()  
  {  
      int val;      
      if (top == n-1)   
      printf("\n Overflow");   
      else   
      {  
          printf("Enter the value?");  
          scanf("%d",&val);         
          top = top + 1;   
          stack[top] = val;   
      }   
  }   
    
  void pop ()   
  {   
      if(top == -1)   
      printf("Underflow");  
      else  
      top = top -1;   
  }   
  void show()  
  {  
      for (i = top; i >= 0; i--)  
      {  
          printf("%d\n",stack[i]);  
      }  
      if(top == -1)   
      {  
          printf("Stack is empty");  
      }  
  }  
  