View Compilation Error

0_0_27799290_18409.cpp: In function 'int main()':
0_0_27799290_18409.cpp:17:24: error: expected '}' at end of input
   printf("%.2lf\n",a_1);            //用一行输出所求得的a1(保留2位小数). 
                        ^
0_0_27799290_18409.cpp:17:24: error: expected '}' at end of input