[algogeeks] reason

[Nitin]

 #include<stdio.h>
#define fun(arg) do\
{\
        if(arg)\
        printf("have fun...","\n");\
}while(i--)

main()
{
        int i=6;
        fun(i<5);
}

give the answer and please give the reason for this

#include<stdio.h>
#define fun(a,b) a##b
 main()
{
        int a, b, ab;
        a = 1, b = 2, ab = 3;
        printf("%d %d", fun(a,b), ab);
        return -1;

}
please tell me the use of this # in this program
~

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