file for application folder #5

Applications/Computational_Algorithm_Application/stack.cpp

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+//STACK APPLICATION IN REAL LIFE
+
+/*in real world stack sata structure is used for
+    1)backward and forward button in browsers
+    2)memory management in computer programming
+    3)delimiter checking
+    4)undo and redo options 
+    5)implementation recursion in programming
+    etc.
+*/
+
+/*here we look at some of the real life implementation on small scale which can be enlarged for large data later
+    1)undo and redo
+    2)delimiter
+
+    code is very simple and self explanatory so no comments are given.
+*/
+
+#include<bits/stdc++.h>
+using namespace std;
+
+
+void print(vector<int>arr){
+    cout<<"operation performed in order: ";
+    for (int i = 0; i < arr.size(); i++)
+    {
+        cout<<arr[i]<<' ';
+    }
+    cout<<endl;
+}
+
+void Undo(stack<int>&s,stack<int>&t,vector<int>arr){
+    if(s.size()==0){
+        cout<<"nothing to undo";
+        return;
+    }
+    t.push(s.top());
+    s.pop();
+    cout<<"undo done:"<<endl;
+    for (int i = 0; i < s.size(); i++)
+    {
+        cout<<arr[i]<<' ';
+    }
+    cout<<endl;
+    return;
+}
+
+void Redo(stack<int>&s,stack<int>&t,vector<int>arr){
+    if(t.size()==0){
+        cout<<"nothing to redo"<<endl;
+        return;
+    }
+    s.push(t.top());
+    t.pop();
+    cout<<"redo done:"<<endl;
+    for (int i = 0; i < s.size(); i++)
+    {
+        cout<<arr[i]<<' ';
+    }
+    cout<<endl;
+    return;
+}
+//delimiter is a way of checking if an sequence have an end for every start
+// here look that application with use of brackets balancing.
+
+void delimiterCheck(string l){
+    stack<char>s;
+    for (int i = 0; i < l.length(); i++)
+    {
+        if(l[i]=='('||l[i]=='{'||l[i]=='['){
+            s.push(l[i]);
+        }
+        else if (l[i]==')'||l[i]=='}'||l[i]==']')
+        {
+            if(s.empty()==true){
+                cout<<"brackets are not balanced"<<endl;
+                return;
+            }
+
+            char top=s.top();
+            if((top=='('&&l[i]==')')||(top=='{'&&l[i]=='}')||(top=='['&&l[i]==']')){
+                s.pop();
+            }
+            else {
+                cout<<"brackets are not balanced";
+                return;
+            }
+        }
+    }
+    if(s.empty()==true){
+        cout<<"brackets are balanced"<<endl;
+        return;
+
+    }
+    else{
+        cout<<"brackets are not balanced"<<endl;
+        return;
+    }
+}
+
+int main(){
+    int n;
+    cout<<"enter number of operation you want to perform: ";
+    cin>>n;
+
+    vector<int>arr;
+    stack<int>s;
+    stack<int>t;
+
+    for(int i=0;i<n;i++)
+    {
+        int k;
+        cout<<"enter operation number you want to perform(integer value): ";
+        cin>>k;
+        arr.push_back(k);
+        s.push(k);    
+        print(arr);
+    }
+
+    int chk=0;
+    cout<<"perform undo/redo/none (type 0/1/else): ";
+    cin>>chk;
+    if(chk==1)Redo(s,t,arr);
+    else if(chk==0)Undo(s,t,arr);
+
+    cout<<"to check bracket balancing give any operation(eg- (1+2)*5 ): ";
+    string l;
+    cin>>l;
+    delimiterCheck(l);
+    return 0;
+}