View Compilation Error

0_0_7146276_29044.cpp:3: error: `main' must return `int'
0_0_7146276_29044.cpp: In function `int main(...)':
0_0_7146276_29044.cpp:12: error: `nmaxnum' undeclared (first use this function)
0_0_7146276_29044.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)