View Compilation Error

0_0_30396671_15174.cpp:2:4: error: expected unqualified-id before 'for'
    for (k = 0; k < 2 * n - 1; k++) {
    ^
0_0_30396671_15174.cpp:2:16: error: 'k' does not name a type
    for (k = 0; k < 2 * n - 1; k++) {
                ^
0_0_30396671_15174.cpp:2:31: error: 'k' does not name a type
    for (k = 0; k < 2 * n - 1; k++) {
                               ^
0_0_30396671_15174.cpp:5:4: error: 'cout' does not name a type
    cout << endl;
    ^
0_0_30396671_15174.cpp:6:3: error: expected declaration before '}' token
   }
   ^