View Compilation Error

0_0_20556694_4385.cpp: In function 'int main()':
0_0_20556694_4385.cpp:68:16: error: 'n' was not declared in this scope
         scan_d(n),scan_d(m),scan_d(k);
                ^
0_0_20556694_4385.cpp:68:26: error: 'm' was not declared in this scope
         scan_d(n),scan_d(m),scan_d(k);
                          ^
0_0_20556694_4385.cpp:68:36: error: 'k' was not declared in this scope
         scan_d(n),scan_d(m),scan_d(k);
                                    ^
0_0_20556694_4385.cpp:69:15: error: 'read' was not declared in this scope
         read(n),read(m),read(k);
               ^