#define ADDx x+x #include stdioh int main int m = 1; int n = 2; int k = 3; int sum = ADDm + n k; printfsum = dn sum;

The code defines a macro ADD(x) which takes an argument x and returns x + x.

The main function initializes three integer variables m, n, and k with the values 1, 2, and 3 respectively.

Then, it calculates the sum by using the ADD macro with the expression m + n and multiplies the result by k.

Finally, it prints the value of sum using printf.