foo.c:1:9: error: #include expects "FILENAME" or <FILENAME>
    1 | #include
      |         ^
foo.c:3:1: error: unknown type name 'using'
    3 | using namespace std;
      | ^~~~~
foo.c:3:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    3 | using namespace std;
      |                 ^~~
foo.c:5:1: error: unknown type name 'ifstream'
    5 | ifstream fin("a.in");
      | ^~~~~~~~
foo.c:5:14: error: expected declaration specifiers or '...' before string constant
    5 | ifstream fin("a.in");
      |              ^~~~~~
foo.c:7:1: error: unknown type name 'ofstream'
    7 | ofstream fout("a.out");
      | ^~~~~~~~
foo.c:7:15: error: expected declaration specifiers or '...' before string constant
    7 | ofstream fout("a.out");
      |               ^~~~~~~
foo.c: In function 'main':
foo.c:15:1: error: 'fin' undeclared (first use in this function)
   15 | fin>>m;
      | ^~~
foo.c:15:1: note: each undeclared identifier is reported only once for each function it appears in
foo.c:19:10: error: invalid operands to binary - (have 'int' and 'int *')
   19 | b[i]=a[i]-a;
      |      ~~~~^
      |       |  |
      |       |  int *
      |       int
foo.c:19:12: error: expected ')' before ';' token
   19 | b[i]=a[i]-a;
      |            ^
      |            )
foo.c:17:4: note: to match this '('
   17 | for(i=1;i>a[i];
      |    ^
foo.c:21:1: error: expected expression before '}' token
   21 | }
      | ^
foo.c:13:23: warning: variable 'b' set but not used [-Wunused-but-set-variable]
   13 | int i,j,m,a[1001]={0},b[1001]={0};
      |                       ^
foo.c:13:7: warning: unused variable 'j' [-Wunused-variable]
   13 | int i,j,m,a[1001]={0},b[1001]={0};
      |       ^
foo.c: At top level:
foo.c:23:1: warning: data definition has no type or storage class
   23 | j=b[m]-b[m-1]+b[m];
      | ^
foo.c:23:1: warning: type defaults to 'int' in declaration of 'j' [-Wimplicit-int]
foo.c:23:3: error: 'b' undeclared here (not in a function)
   23 | j=b[m]-b[m-1]+b[m];
      |   ^
foo.c:23:5: error: 'm' undeclared here (not in a function)
   23 | j=b[m]-b[m-1]+b[m];
      |     ^
foo.c:25:1: error: expected '=', ',', ';', 'asm' or '__attribute__' at end of input
   25 | fout
      | ^~~~

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