View Compilation Error

0_0_6835286_13064.cpp:8: error: `_TCHAR' has not been declared
0_0_6835286_13064.cpp:9: error: ISO C++ forbids declaration of `argv' with no type
0_0_6835286_13064.cpp: In function `int _tmain(int, int**)':
0_0_6835286_13064.cpp:20: error: `sqrt' undeclared (first use this function)
0_0_6835286_13064.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)