View Compilation Error

142776_0_11238.cpp: In function `int main()':
142776_0_11238.cpp:4: error: `n' undeclared (first use this function)
142776_0_11238.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
142776_0_11238.cpp:19: error: expected `}' at end of input