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How based are your arrays?

>>38
Lots of existing C code (even fully-conforming code designed to demonstrate proper usage of the standard library functions) would be broken by an implementation that passes array arguments by value.

For example, something like

char str[100];
scanf("%s", str);

is quite common. However, if arrays were passed by value, it would be necessary to instead use

char str[100];
scanf("%s", &str);