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Ass8_Parenthesis.cpp
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Ass8_Parenthesis.cpp
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#include<iostream>
using namespace std;
class Stack
{
private:
char exp[20];
int top;
public:
Stack()
{
top =-1;
}
bool isEmpty()
{
if (top==-1)
return true;
else
return false;
}
bool isFUll()
{
if (top==19)
return true;
else
return false;
}
void push(char k)
{
if(!isFUll())
exp[++top]=k;
}
char pop()
{
if(!isEmpty())
return exp[top--];
}
void check(string s)
{
int n=s.length();
int i=0;
if(s[i]=='}'|| s[i]==']'|| s[i]==')')
{
cout<<"Invalid expression\n";
return;
}
while(i<n)
{
if(s[i]=='{'|| s[i]=='['|| s[i]=='(')
{
push(s[i]);
}
if(s[i]=='}'|| s[i]==']'|| s[i]==')')
{
if(isEmpty())
{
cout<<"Number of opening brackets is less\n";
return;
}
char temp;
temp=pop();
if(temp=='(' && s[i]!=')' || temp=='[' && s[i]!=']'||temp=='{' && s[i]!='}')
{
cout<<"Bracket error\n";
return;
}
}
i++;
}
if(!isEmpty())
{
cout<<"Number of closing brackets is less\n";
return;
}
else
{
cout<<"\nValid Expression\n\n";
}
}
};
int main()
{
Stack s;
cout<<"*****EXPRESSION VALIDATOR*****\n";
char c;
do{
string p;
cout<<"Enter the Expression: ";
cin>>p;
s.check(p);
cout<<"Do you want to continue??\n>>";
cin>>c;
}while(c=='y'||c=='Y');
return 0;
}