View Compilation Error

260261_0_27465.cpp: In function `int main()':
260261_0_27465.cpp:6: error: `n' undeclared (first use this function)
260261_0_27465.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
260261_0_27465.cpp:11: error: cannot convert `float*' to `float' in assignment
260261_0_27465.cpp:12: error: cannot convert `float*' to `float' in assignment