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The default initialization of an int is zero, so they are incrementing the static count prior to the assignment. This will yield 1 for the first object created. If you wanted to explicitly initialize a static data member, it would be defined outside of the class, e.g.:
int Student::student_id = 0;
Normally, the static members would be declared in the header file, and initialized similar to the above at the top of the implementation file.
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Virtual Functions
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The default initialization of an int is zero, so they are incrementing the static count prior to the assignment. This will yield 1 for the first object created. If you wanted to explicitly initialize a static data member, it would be defined outside of the class, e.g.:
int Student::student_id = 0;Normally, the static members would be declared in the header file, and initialized similar to the above at the top of the implementation file.