View Compilation Error

114589_0_1840.cpp: In function `void go(int)':
114589_0_1840.cpp:20: error: `tm' undeclared (first use this function)
114589_0_1840.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
114589_0_1840.cpp: In function `int main()':
114589_0_1840.cpp:84: error: `tm' undeclared (first use this function)