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How to write program during compiling?

I found this problem on a site full of interview questions, and was stumped by it. Is there some preprocessor directive that allows one to read from standard input during compilation?

Write a small C program, which while compiling takes another program from input terminal, and on running gives the result for the second program. (NOTE: The key is, think UNIX). Suppose, the program is 1.c Then, while compiling

$ cc -o 1 1.c 
int main() { printf("Hello World\n"); } ^D 
$ ./1
Hello World

EDIT It turns out this question is an exact duplicate. How to write program during compiling?

Answer 1

#include "/dev/stdin" is the trick.

A silly interview question at best.