View Compilation Error

0_0_4613556_23863.cpp:4: error: `main' must return `int'
0_0_4613556_23863.cpp: In function `int main(...)':
0_0_4613556_23863.cpp:26: error: `getch' undeclared (first use this function)
0_0_4613556_23863.cpp:26: error: (Each undeclared identifier is reported only once for each function it appears in.)