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A C Programming Language Puzzle

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

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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;
}

Output:

3612

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



This article is attributed to GeeksforGeeks.org

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