View Compilation Error

204330_0_9858.cpp: In function `int main()':
204330_0_9858.cpp:6: error: `n' undeclared (first use this function)
204330_0_9858.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
204330_0_9858.cpp:8: error: expected `;' before "while"
204330_0_9858.cpp:25: error: expected `}' at end of input