View Compilation Error

0_0_9271903_2310.cpp: In function `int main()':
0_0_9271903_2310.cpp:4: error: `n' does not name a type
0_0_9271903_2310.cpp:7: error: `a' undeclared (first use this function)
0_0_9271903_2310.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9271903_2310.cpp:7: error: `i' undeclared (first use this function)
0_0_9271903_2310.cpp:7: error: `n' undeclared (first use this function)
0_0_9271903_2310.cpp:13: error: expected `;' before "while"
0_0_9271903_2310.cpp:18: error: expected `)' before "average"
0_0_9271903_2310.cpp:19: error: expected `}' at end of input