Skip to content
Related Articles

Related Articles

Improve Article

A C Programming Language Puzzle

  • Difficulty Level : Easy
  • Last Updated : 21 Jun, 2018

Give a = 12 and b = 36 write a C function/macro that returns 3612 without using arithmetic, strings and predefined functions.

We strongly recommend you to minimize your browser and try this yourself first.

Below is one solution that uses String Token-Pasting Operator (##) of C macros. For example, the expression “a##b” prints concatenation of ‘a’ and ‘b’.

Below is a working C code.

#include <stdio.h>
#define merge(a, b) b##a
int main(void)
    printf("%d ", merge(12, 36));
    return 0;



Thanks to an anonymous user to suggest this solution.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above

Want to learn from the best curated videos and practice problems, check out the C Foundation Course for Basic to Advanced C.
My Personal Notes arrow_drop_up
Recommended Articles
Page :