/in/foo.c: In function 'main':
/in/foo.c:22:17: error: 'i' undeclared (first use in this function)
   for(int k=mi2(i-1)-1;k>0;k--){
                 ^
/in/foo.c:22:17: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:25:7: error: 'k' undeclared (first use in this function)
   for(k=0;k<mi2(i-1);k++){
       ^