Hiding Names

Hiding Names - "xxx" and the program is simply...

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Hiding Names Consider this small example: #include <stdio.h> int xxx[10]; int main() { struct xxx { int a; }; printf("%d\n", sizeof(xxx)); return 0; } When compiled as C code, it will typically print a value like 20 or 40, whereas when treated as C++, the output value will likely be 2 or 4. Why is this? In C++, the introduction of the local struct declaration hides the global
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Unformatted text preview: "xxx", and the program is simply taking the size of a struct which has a single integer member in it. In C, "sizeof(xxx)" refers to the global array, and a tag like "xxx" doesn't automatically refer to a struct. If we said "sizeof(struct xxx)" then we would be able to refer to the local struct declaration....
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This note was uploaded on 02/27/2012 for the course CS 251 taught by Professor Staff during the Fall '08 term at Purdue.

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