/in/foo.c: In function 'main':
/in/foo.c:6:5: error: expected expression before ';' token
    6 |  if(;n>=1&&n<=99999;){
      |     ^
/in/foo.c:7:2: error: expected declaration or statement at end of input
    7 |  printf("%d\n",n);
      |  ^~~~~~
/in/foo.c:7:2: error: expected declaration or statement at end of input