C Programming
String concatenation means -

Extracting a substring out of a string.
Partitioning the string into two strings.
Comparing the two strings to define the larger one.
Merging two strings.
Combining two strings.

ANSWER DOWNLOAD EXAMIANS APP

C Programming
A preprocessor command

need not start on the first column
comes before the first executable statement
need not start on a new line
has # as the first character

ANSWER DOWNLOAD EXAMIANS APP