View Compilation Error

0_0_31379198_8960.cpp: In function 'int main()':
0_0_31379198_8960.cpp:18:1: error: a function-definition is not allowed here before '{' token
 {
 ^
0_0_31379198_8960.cpp:23:9: error: 'i' was not declared in this scope
   if(n<=i*i*i)
         ^