foo.c:1:6: warning: return type of 'main' is not 'int' [-Wmain]
    1 | void main()
      |      ^~~~
foo.c: In function 'main':
foo.c:3:16: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    3 |         int n; scanf("%d\n", &n);
      |                ^~~~~
foo.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | void main()
foo.c:3:16: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    3 |         int n; scanf("%d\n", &n);
      |                ^~~~~
foo.c:3:16: note: include '<stdio.h>' or provide a declaration of 'scanf'
foo.c:7:15: warning: comparison of constant '100000' with boolean expression is always true [-Wbool-compare]
    7 |         if(0<n<100000){if(0<x<=1000){
      |               ^
foo.c:7:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
    7 |         if(0<n<100000){if(0<x<=1000){
      |            ~^~
foo.c:7:30: warning: comparison of constant '1000' with boolean expression is always true [-Wbool-compare]
    7 |         if(0<n<100000){if(0<x<=1000){
      |                              ^~
foo.c:7:28: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
    7 |         if(0<n<100000){if(0<x<=1000){
      |                           ~^~
foo.c:16:17: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   16 |         }       printf("%d\n",y);
      |                 ^~~~~~
foo.c:16:17: note: include '<stdio.h>' or provide a declaration of 'printf'
foo.c:16:17: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
foo.c:16:17: note: include '<stdio.h>' or provide a declaration of 'printf'

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