View Compilation Error

0_0_15363902_11025.cpp: In function 'int main()':
0_0_15363902_11025.cpp:13:22: error: increment of read-only location '(const char*)"Case #<<"'
   cout << "Case #<<" ++k << ": " << 2*n -1 << endl;
                      ^
0_0_15363902_11025.cpp:13:22: error: lvalue required as increment operand
0_0_15363902_11025.cpp:15:1: error: expected '}' at end of input
 }
 ^