View Compilation Error

0_0_30941493_20415.cpp: In function 'int main()':
0_0_30941493_20415.cpp:6:3: error: expected ';' before 'if'
   if(a<0)
   ^
0_0_30941493_20415.cpp:8:3: error: 'else' without a previous 'if'
   else
   ^