/in/foo.c:3:5: error: two or more data types in declaration specifiers
    3 | int void a(int x,int i)
      |     ^~~~
/in/foo.c: In function 'a':
/in/foo.c:6:4: error: expected '(' before 'x'
    6 | if x%i=0;
      |    ^
      |    (
/in/foo.c:6:4: warning: statement with no effect [-Wunused-value]
/in/foo.c:8:9: error: 'else' without a previous 'if'
    8 |         else
      |         ^~~~
/in/foo.c: In function 'main':
/in/foo.c:15:4: error: expected expression before 'void'
   15 |  n=void a(x);
      |    ^~~~
/in/foo.c:16:11: warning: format '%d' expects a matching 'int' argument [-Wformat=]
   16 |  printf("%d is not aprimer!");
      |          ~^
      |           |
      |           int
/in/foo.c:17:9: error: 'else' without a previous 'if'
   17 |         else
      |         ^~~~
/in/foo.c:18:26: warning: format '%d' expects a matching 'int' argument [-Wformat=]
   18 |                 printf("%d is a primer!");
      |                         ~^
      |                          |
      |                          int
/in/foo.c:13:8: warning: unused variable 'i' [-Wunused-variable]
   13 | {int n,i;
      |        ^