View Compilation Error

187602_0_7188.cpp: In function `int main()':
187602_0_7188.cpp:14: error: `len' undeclared (first use this function)
187602_0_7188.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)
187602_0_7188.cpp:15: error: `t' undeclared (first use this function)
187602_0_7188.cpp:16: error: expected `}' at end of input