ExplanationIn the above program wait () is defined in place of getche (). In the program
#undef directiveundefines the same macro. Hence, the compiler flags an error message
"undefined symbol 'wait' in function main."
11.4 TOKEN PASTING AND STRINGIZING OPERATORS
Stringizing operationIn this operation macro argument is converted to string. The sign # carries
the operation. It is placed before the argument.
11.6 Write a program to carry out stringizing operation.
# include <stdio.h>
# include <conio.h> ...
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