/in/foo.c: In function 'main':
/in/foo.c:12:3: error: 'C' undeclared (first use in this function)
   C[5]={i+1-j};}
   ^
/in/foo.c:12:3: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:12:8: error: expected expression before '{' token
   C[5]={i+1-j};}
        ^
/in/foo.c:14:11: error: expected expression before '[' token
   if(c[h]>[h+1])
           ^
/in/foo.c:18:2: error: 'k' undeclared (first use in this function)
  k=c[0];
  ^