Validity of struct statement.

[nileshjdarji]

Is the below statement valid or invalid.
Explain answer in either case.

  classList[20].pID = 000011100;

[MiiNiPaa]

depends on amoun of elements classList contains, type of pID and do the programmer really intended to write number 4672 in it.

[jlb]

It could be valid, or it could be invalid, there is not enough information provided to answer the question.

[nileshjdarji]

correct i do ge the output as 4672. Why?
pID is of type 'int' and classList has [50] components in it.

[MiiNiPaa]

http://en.cppreference.com/w/cpp/language/integer_literal

octal-literal is the digit zero (0) followed by zero or more octal digits (0, 1, 2, 3, 4, 5, 6, 7)

All numbers starting with 0 threated as written in octal system

[nileshjdarji]

Great!. Got it. So getting back to my original question the statement is Invalid.
Thanks a lot.

[jlb]

What is your compiler telling you?

[nileshjdarji]

complier outputs 4672, if i try to read that number with leading zero in an 'int' variable and then output the same.

[jlb]

So your compiler says the expression is valid, no error or warning messages, and the output appears to be correct for the value provided. So it appears to be a valid line of code. But just because it's a valid line of code doesn't mean it's doing what you intend.

What are you expecting the output to be?

[nileshjdarji]

i do want the output to be 000011100 because that is what was stored in classList[20].pID.

[MiiNiPaa]

that is what was stored in classList[20].pID.

pID contains int. int is an abstract number. As there is no difference in 01 apple or 1 apple, there is no difference between 000011100 and 11100. You cannot say seeing 2 apples on a table if you should write 2 or 0000002 on a list, so ccannot compiler. You need to tell that explicitely: http://ideone.com/abSgEA