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'character' : unrecognized character escape sequence
The character following a backslash (\) in a character or string constant is not recognized as a valid escape sequence. The backslash is ignored and not printed. The character following the backslash is printed.
To print a single backslash, specify a double backslash (\\).
The C++ standard, in section 2.13.2 discusses escape sequences.
The following sample generates C4129:
// C4129.cpp
// compile with: /W1
int main() {
char array1[] = "\/709"; // C4129
char array2[] = "\n709"; // OK
}