/in/foo.c: In function 'main':
/in/foo.c:8:14: error: 'i' undeclared (first use in this function)
    8 |         for (i=0;i<12;i++){
      |              ^
/in/foo.c:8:14: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:5:9: warning: variable 'yusuan' set but not used [-Wunused-but-set-variable]
    5 |     int yusuan[12] = {};
      |         ^~~~~~