Same with what I suggested: #include <stdio.h> #define MYMACRO(a,b,c) \ ({ \ typeof (c) _c = (c); \ a = b + _c; \ b = _c * 2; \

Same with what I suggested: #include <stdio.h> #define MYMACRO(a,b,c) \ ({ \ typeof (c) _c = (c); \ a = b + _c; \ b = _c * 2; \ }) int main() { int a = 0, b = 0; if (1) MYMACRO(a,b,1); else MYMACRO(a,b,2); printf("%d, %d\n", a, b); } ----- $ gcc -o test test.c $ ./test 1, 2 Edit: Just for context: this was responding to a post pointing out that the do-while construct allows you to use a semi-colon after the macro invocation.