View Compilation Error

0_0_22786848_13537.c: In function 'main':
0_0_22786848_13537.c:5:44: error: 'G' undeclared (first use in this function)
  scanf("%d",&n);                           G
                                            ^
0_0_22786848_13537.c:5:44: note: each undeclared identifier is reported only once for each function it appears in
0_0_22786848_13537.c:6:2: error: expected ';' before 'for'
  for(i=1;i<=n;i++)
  ^