GOTO statements are useful ?
Yes. But not for this use case.
how I can go to initial stage of program again when user press Y
There’s a control flow structure for going back and repeating. It is called a loop. An example:
do {
// do some stuff
cin>>q;
} while(q=='Y');
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solved How to go to initial stage of Program without using “goto” and using “do while” loop? [closed]