#include<bits/stdc++.h>
#define max 5
using namespace std;
int pop(int *top,int *data);
int push(int *top,int *data);
int stck[5];
int main(){
int top,option,reply,data;
top=-1;

    while(1){
        cout<<"1.Push"<<endl;
        cout<<"2.Pop"<<endl;
        cout<<"3.Break"<<endl;
        cin>>option;
        switch (option){
    case 1:
        cout<<"Enter a value: ";
        cin>>data;
        reply=push(&top ,&data);
        if(reply==-1){
            cout<<"Overflow / stack if full"<<endl;
        }else{
        cout<<"Pushed value is "<<data<<endl;
        }
        break;
    case 2:
        cout<<"Enter a value: ";
        cin>>data;
        reply=pop(&top ,&data);
        if(reply==-1){
            cout<<"Underflow / stack if Empty"<<endl;
        }else{
        cout<<"Poped value is "<<data<<endl;
        }
        break;
    case 3:
        return 0;

        }

    }

return 0;
}

int push(int *top,int *data){
    if(*top==-1)
        return (-1);
    else{
        *top=*top+1;
        stck[*top]=*data;
        return (1);
    }
}
int pop(int *top,int *data){
    if(*top==-1)
        return (-1);
    else{
        *data=stck[*top];
        *top=*top-1;
        return (1);
    }
}