double points;
start:
cout << "points:"; cin >> points;
if (points<=0) return 0;
if(points>=0 && points <=39) // -------------------------------------------------start of the block
{
cout << "your mark is 2.0" << endl;
}
else if (points >39 && points <=54)
{
cout<< "your mark is 3.0"<< endl;
}
else if (points >54 && points <=69)
{
cout<< "your mark is 3.5" <<endl;
}
else if (points >69 && points <=84)
{
cout<< "your mark is 4.0" << endl;
}
else if (points >84 && points <=98)
{
cout<<"your mark is 4.5" << endl;
}
else
{
cout <<"your mark is 5.0"<<endl;
}
goto start; // loop back
//--------------------------------------------------------end of the block
return 0;
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