View Compilation Error

0_0_38454097_15401.cpp:34:4: error: 'b' does not name a type
 }  b=sum-a;
    ^
0_0_38454097_15401.cpp:35:4: error: expected unqualified-id before 'if'
    if(i!=n-1)
    ^
0_0_38454097_15401.cpp:37:3: error: expected declaration before '}' token
   }
   ^