View Compilation Error

0_0_4806891_32231.cpp: In function `int main()':
0_0_4806891_32231.cpp:5: error: `n' undeclared (first use this function)
0_0_4806891_32231.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4806891_32231.cpp:25: error: expected `;' before '{' token
0_0_4806891_32231.cpp:33: error: expected `;' before '}' token
0_0_4806891_32231.cpp:33: error: expected `}' at end of input