2/14/2019 C++ exercise #2

#include <iostream.h>
#include <conio.h>
#include <string.h>
#include <stdlib.h>
int main()
{
int a;
char d[100];
X:clrscr();
cout<<"enter a string: ";
cin>>d;
 a=strlen(d);
 if(d[0]=='('&&d[1]=='('){
  if(d[a-1]==')'&&d[a-2]==')'){
   cout<<"valid";
   getch();
   goto X;
  }
  else{
    cout<<"invalid";
    getch();
    goto X;
   }
  }
 else if(d[0]=='['&&d[1]=='['){
  if(d[a-1]==']'&&d[a-2]==']'){
   cout<<"valid";
   getch();
   goto X;
   }
   else{
    cout<<"invalid";
    getch();
    goto X;
   }
  }
 else if(d[0]=='{'&&d[1]=='{'){
  if(d[a-1]=='}'&&d[a-2]=='}'){
   cout<<"valid";
   getch();
   goto X;
   }
   else{
    cout<<"invalid";
    getch();
    goto X;
   }
  }
  else if(!strcmp(d,"exit")){
    exit(0);
   }
  else{
   cout<<"invalid";
   getch();
   goto X;
  }
return 0;
}