if this is one statement then why we are using << again and again . what will happen

[sana.pari]

Dear Sir,

you said before that cout<<"the digit is:"<<digit<<'\n';

i have confusion in this statement. if this is one statement then why we are using << again and again . what will happened if

cout<<"the digit is:";

cout<<digit;

cout<<'\n';

and what will happened if we shall use << one time like cout<<"the digit is :" digit '\n;

and also in ICS i have studied c but that time we use blue screen for source code and black screen for run and both were there in the same window. i am confuse in these all like devc++, c++, c, c sharp. and what was that C++. and also we did not use there CMD and programms were running..

please sir explain in detail. i am so worry because assingment date is very close.

thank you very much