View Compilation Error

0_0_8501320_1594.cpp: In function `void pre()':
0_0_8501320_1594.cpp:37: error: `tm' undeclared (first use this function)
0_0_8501320_1594.cpp:37: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8501320_1594.cpp: In function `void after()':
0_0_8501320_1594.cpp:51: error: `tm' undeclared (first use this function)