I was learning about structures in C++. I had a question:
1.struct integer
2.{
3. int i;
4. integer (int j = 0) : i (j) {};
5. integer operator* (const integer &k) const
6. {
7. return integer (i + k.i);
8. }
9.};In the above code, i was not able to understand the :i(j) in line 4 and const which is at the end of line 5. What does these mean?
maybe you are using a C compiler instead of C++
I am using a C++ compiler. That is not an issue.
I wanted to understand the declarations done inside the structure.
> i was not able to understand the :i(j) in line 4
It initialises i (you member variable) with j (the parameter).
Compare with integer (int j = 0) { i = j; }; which is an assignment.
http://www.parashift.com/c++-faq-lite/ctors.html#faq-10.6
> const which is at the end of line 5. What does these mean?
It means that the function will not modify the internal state of the class.
http://www.parashift.com/c++-faq-lite/const-correctness.html#faq-18.10
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