stack with struct in c++

#include<iostream> #include<stack> using namespace std; bool isValid(string s) { stack<char> st; for (int i = 0; i < s.length(); i++) { if (s[i] == '(' || s[i] == '{' || s[i] == '[') st.push(s[i]); if (!st.empty()) { if (s[i] == ')') { if (st.top() == '(') { st.pop(); continue; } else break; } // if (s[i] == '}') { if (st.top() == '{') { st.pop(); continue; } else break; } // if (s[i] == ']') { if (st.top() == '[') { st.pop(); continue; } else break; } } else return false; } return st.empty() ? true : false; } int main() { string s; cin >> s; cout << isValid(s) << "\n"; return 0; }

stack in c++

#include <iostream>

using namespace std;
#define M 100 //defined the size of the stack ;

//stack class for controlling

class STACK
{
    int ara[M]; // declared an array for storing the stack elemenst
    int top; // finding the top value
public:
    //function for pushing values into the stack
    STACK() // constructor for initializing
    {
        top = 0;
    }
    void push(int n)
    {
        if(top == M) // checking if the stack is full or not
        {
            cout << "Stack is full\n";
            return;
        }else // if the stack is not full, push the element
        {
            ara[top] = n;
            top++;
        }
    }
    //function for poping out elements from the stack or getting the elements
    int pop()
    {
        if(top == 0)
        {
            cout << "Stack is empty\n";
            return 0;
        }else
        {
            top--;
            return ara[top];
        }
    }
    
};


int main()
{
    STACK stk1, stk2; //making two objects of type STACK
    
    //pushing elements
    for(int i = 0; i < 5; i++)
    {
        stk1.push(i);
        stk2.push(i+1);
    }
    
    //poping elements
    for(int i = 0; i < 5; i++)
    {
        cout << stk1.pop() << " ";
    }
    
    cout << "\n";
    
    for(int i = 0; i < 5; i++)
    {
        cout << stk2.pop() << " ";
    }
    cout << "\n";
    return 0;
}

Posted by: Guest on January-24-2022

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