/in/foo.c: In function 'main':
/in/foo.c:5:5: error: 'longlongi' undeclared (first use in this function); did you mean 'long long int'?
    5 |     longlongi=2
      |     ^~~~~~~~~
      |     long long int
/in/foo.c:5:5: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:5:16: error: expected ';' before 'longlong'
    5 |     longlongi=2
      |                ^
      |                ;
    6 |     longlong arr[1000]={0};
      |     ~~~~~~~~    
/in/foo.c:7:5: error: 'arr' undeclared (first use in this function)
    7 |     arr[0]=1;
      |     ^~~
/in/foo.c:10:21: error: 'i' undeclared (first use in this function)
   10 |                 arr[i]=arr[i-1]+arr[i-2]
      |                     ^
/in/foo.c:10:41: error: expected ';' before 'if'
   10 |                 arr[i]=arr[i-1]+arr[i-2]
      |                                         ^
      |                                         ;
   11 |                         if(arr[i]>=20000)
      |                         ~~               
/in/foo.c:19:27: error: expected ';' before 'return'
   19 |         printf("%.2f",sum)
      |                           ^
      |                           ;
   20 |         return 0;
      |         ~~~~~~