View Compilation Error

1_866_556_32270.cpp:1:1: error: expected unqualified-id before 'if'
 if(s>=100&&s<150)
 ^
1_866_556_32270.cpp:5:5: error: expected unqualified-id before 'else'
     else if(s>=150&&s<400)
     ^
1_866_556_32270.cpp:9:5: error: expected unqualified-id before 'else'
     else if(s>=400)
     ^