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stack c++

Paulo Pignatelli 
#include <iostream>
using namespace std;
int stack[100], n=100, top=-1;
void push(int val) {
   if(top>=n-1)
   cout<<"Stack Overflow"<<endl;
   else {
      top++;
      stack[top]=val;
   }
}
void pop() {
   if(top<=-1)
   cout<<"Stack Underflow"<<endl;
   else {
      cout<<"The popped element is "<< stack[top] <<endl;
      top--;
   }
}
void display() {
   if(top>=0) {
      cout<<"Stack elements are:";
      for(int i=top; i>=0; i--)
      cout<<stack[i]<<" ";
      cout<<endl;
   } else
   cout<<"Stack is empty";
}
int main() {
   int ch, val;
   cout<<"1) Push in stack"<<endl;
   cout<<"2) Pop from stack"<<endl;
   cout<<"3) Display stack"<<endl;
   cout<<"4) Exit"<<endl;
   do {
      cout<<"Enter choice: "<<endl;
      cin>>ch;
      switch(ch) {
         case 1: {
            cout<<"Enter value to be pushed:"<<endl;
            cin>>val;
            push(val);
            break;
         }
         case 2: {
            pop();
            break;
         }
         case 3: {
            display();
            break;
         }
         case 4: {
            cout<<"Exit"<<endl;
            break;
         }
         default: {
            cout<<"Invalid Choice"<<endl;
         }
      }
   }while(ch!=4);
   return 0;
}
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4
5
Frerich Raabe 85 points 

                                    typedef struct Nodo{
   Elem val;
   struct Nodo *next;
} *Stack;
Stack Empty(){return NULL;}
bool IsEmpty(Stack a){return a==NULL;}
Elem Top(Stack a){return a-&gt;val;} 
Stack Pop(Stack l){return l-&gt;next;}
Stack Push(Elem x,Stack res){
    Stack nuevo=(Stack)malloc(sizeof(struct Nodo));
    nuevo-&gt;val=x;
    nuevo-&gt;next=res;
    return nuevo;
}

4 (5 Votes)
0
3.5
2
Damian Siniakowicz 125 points 

                                    // Fast DIY Stack
template&lt;class S, const int N&gt; class Stack {
private:
    S arr[N];
    int top_i;

public:
    Stack() : arr(), top_i(-1) {}
    void push (S n) {
        arr[++top_i] = n;
    }
    void pop() {
        top_i--;
    }
    S top() {
        return arr[top_i];
    }
    S bottom() {
        return arr[0];
    }
    int size() {
        return top_i+1;
    }
};

3.5 (2 Votes)
0
3.67
3
Ayane 100 points 

                                    /* Stack is a data structure that provides two O(1) time operations:
adding an element to the top and removing an element from the top.
It is only possible to access the top element of a stack. */
stack&lt;int&gt; s;
s.push(3);
s.push(2);
s.push(5);
cout &lt;&lt; s.top(); // 5
s.pop();
cout &lt;&lt; s.top(); // 2

3.67 (3 Votes)
0
4
7
Jaclyn 80 points 

                                    stack&lt;int&gt; stk;
stk.push(5);
int ans = stk.top(5); // ans =5
stk.pop();//removes 5

4 (7 Votes)
0
5
1
B0nk3r 75 points 

                                    #include &lt;bits/stdc++.h&gt; 

stack&lt;int&gt; stk;
stk.push(5);
int ans = stk.top(5); // ans =5
stk.pop();//removes 5

5 (1 Votes)
0
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