View Compilation Error

0_0_15487323_31682.cpp:8:2: error: missing terminating " character
  ("if a<=n
  ^
0_0_15487323_31682.cpp:13:1: error: missing terminating " character
 end if")
 ^
0_0_15487323_31682.cpp: In function 'int main()':
0_0_15487323_31682.cpp:9:7: error: expected ')' before ';' token
  b=b+a;
       ^
0_0_15487323_31682.cpp:11:2: error: 'else' without a previous 'if'
  else
  ^
0_0_15487323_31682.cpp:13:1: error: expected ';' before 'end'
 end if")
 ^