View Compilation Error

0_0_10111708_18146.cpp:17: error: `main' must return `int'
0_0_10111708_18146.cpp: In function `int main(...)':
0_0_10111708_18146.cpp:36: error: `atoi' undeclared (first use this function)
0_0_10111708_18146.cpp:36: error: (Each undeclared identifier is reported only once for each function it appears in.)