/in/foo.c: In function 'main':
/in/foo.c:6:16: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'prime'
    6 |         int is prime=1;
      |                ^~~~~
/in/foo.c:6:16: error: 'prime' undeclared (first use in this function)
/in/foo.c:6:16: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:10:17: error: unknown type name 'is'
   10 |                 is prime=0;
      |                 ^~
/in/foo.c:10:20: warning: unused variable 'prime' [-Wunused-variable]
   10 |                 is prime=0;
      |                    ^~~~~
/in/foo.c:12:17: error: unknown type name 'is'
   12 |                 is prime=1;
      |                 ^~
/in/foo.c:12:20: warning: unused variable 'prime' [-Wunused-variable]
   12 |                 is prime=1;
      |                    ^~~~~
/in/foo.c:14:17: error: unknown type name 'is'
   14 |                 is prime=0;
      |                 ^~
/in/foo.c:14:20: warning: unused variable 'prime' [-Wunused-variable]
   14 |                 is prime=0;
      |                    ^~~~~
/in/foo.c:19:33: error: unknown type name 'is'
   19 |                                 is prime=0;
      |                                 ^~
/in/foo.c:19:36: warning: unused variable 'prime' [-Wunused-variable]
   19 |                                 is prime=0;
      |                                    ^~~~~
/in/foo.c:24:13: error: 'is' undeclared (first use in this function)
   24 |         if (is prime){
      |             ^~
/in/foo.c:24:15: error: expected ')' before 'prime'
   24 |         if (is prime){
      |            ~  ^~~~~~
      |               )