View Compilation Error

0_0_8032778_13204.cpp:3: error: `n' was not declared in this scope
0_0_8032778_13204.cpp:4: error: expected `,' or `;' before '{' token
0_0_8032778_13204.cpp: In function `int main()':
0_0_8032778_13204.cpp:24: error: `fun' cannot be used as a function