/in/foo.c: In function 'main':
/in/foo.c:6:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'scanf'
    6 |         scanf("%d",&n);
      |         ^~~~~
/in/foo.c:6:21: error: 'n' undeclared (first use in this function)
    6 |         scanf("%d",&n);
      |                     ^
/in/foo.c:6:21: note: each undeclared identifier is reported only once for each function it appears in