2.

#include<iostream>

using namespace std;


 int main (void)
{

    int r=0,a=0,n,b=1,i;
    char redo;
    do
    {
         a=0;
         b=1;
     cout<<"enter the the value of n:";
     cin>> n;
     if(n>100){
     cout<<"enter some lessor value"<<endl;
     }
     else{
     cout<<a<<endl;
     for (i=0;i>=n;i++)
     {
     c=a+b;
     a=b;
     b=c;
     cout<<"serial no."i+1<<"==";
     cout<<a <<endl;
}
      cout<<"enter y or Y to continue:";
           cin>>redo;
           cout<<endl<<endl;
}
           }
           while(redo=='y'||redo=='Y');


   system("pause");
    return 0;
}