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4.PARENTESIS.cpp
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4.PARENTESIS.cpp
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//signs brackets ''
#include<iostream>
#include<conio.h>
#include<string.h>
using namespace std;
class stackp
{
private:
char s[50];
char infix[50];
int top;
public:
stackp()
{
top=-1;
}
void getdata()
{
cout<<"\n";
fflush(stdin);
cout<<"enter infix exp : ";
cin>>infix;
cout<<"\n";
}
char pop()
{
return(s[top--]);
}
void evaluate()
{
cout<<"\n";
int i;
char op;
top=-1;
for(i=0;infix[i]!='\0';i++)
{
if(infix[i]=='(' || infix[i]=='{' || infix[i]=='[')
{
s[++top]=infix[i];
}
else if(infix[i]==')' || infix[i]=='}' || infix[i]==']')
{
op=pop();
if(op=='('&&infix[i]==')' || op=='{'&&infix[i]=='}' || op=='['&&infix[i]==']')
continue;
else
{
cout<<"Parenthesis does not match";
cout<<"\n";
return;
}
}
}
if(top==-1)
{
cout<<"Parenthesis match";
cout<<"\n";
}
else
{
cout<<"Parenthesis does not match";
cout<<"\n";
}
cout<<"\n";
}
};
main()
{
stackp s1;
int op=-1;
while(op!=0)
{
cout<<"\n\n***VERPISS DICH***"<<endl;
cout<<"1:ENTER INFIX EXP."<<endl;
cout<<"2:EVALUATE"<<endl;
cout<<"3:EXIT"<<endl;
cout<<"ENTER CHOICE : ";
cin>>op;
switch(op)
{
case 1:
s1.getdata();
break;
case 2:
s1.evaluate();
break;
case 3:
op=0;
break;
}
}
}