How to implement Short Quines in C?

1) Quine Using Macros :

#define Z(x)t=#x;x

Z(main(){printf("#define Z(x)t=#x;x\nZ(%s)",t);})

2) Use a variable without declaring

b;main(a,s){printf(s="b;main(a,s){printf(s=%c%s%c,34,s,34,a,b);}",34,s,34,a,b);}

In the above quine, there is no need to declare s char *s

3) Initialize variables without assigning values explicitly

b;main(a,s){printf(s="b;main(a,s){printf(s=%c%s%c,34,s,34,a,b);}",34,s,34,a,b);}

In the above quine, a and b are integer variables initialized to 1 and 0 respectively.

4) Use ternary operators if possible

#define Z(x)t=#x;x

Z(main(i){for(;12%++i;);printf(i-12?"#define Z(x)t=#x;x\nZ(%s)":"YES",t);})

The above program acts as a quine if a number is composite else prints “Yes”.

Replace 12 by other numbers to check.

5) Use logical operators:

Example :

The code :

if(n%2==0)

n=n/2;

else

n=n*2;

printf(“%d\n”, n);

can be rewritten as :

printf("%d\n", n%2?n*2:n/2);