/in/foo.c: In function 'main':
/in/foo.c:8:12: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    8 |            for(int i=1;i<=n;i++);
      |            ^~~
/in/foo.c:9:12: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
    9 |            {
      |            ^
/in/foo.c:10:26: error: 'i' undeclared (first use in this function)
   10 |                    fact*=i;
      |                          ^
/in/foo.c:10:26: note: each undeclared identifier is reported only once for each function it appears in