/in/foo.c: In function 'main':
/in/foo.c:9:17: error: expected '(' before '{' token
    9 |         }else if{
      |                 ^
      |                 (
/in/foo.c:10:17: warning: statement with no effect [-Wunused-value]
   10 |                 n>=70&&n<=79;
      |                 ^
/in/foo.c:12:17: error: expected '(' before '{' token
   12 |         }else if{
      |                 ^
      |                 (
/in/foo.c:13:17: warning: statement with no effect [-Wunused-value]
   13 |                 n>=60&&n<=69;
      |                 ^