View Compilation Error

0_0_37690193_29892.cpp:2:1: error: expected unqualified-id before 'else'
 else r=t; }double a=a_t(t); double S=pi-a+sin(a)*cos(a); printf("%.5f\n",S/cos(t)); } }
 ^
0_0_37690193_29892.cpp:2:11: error: expected declaration before '}' token
 else r=t; }double a=a_t(t); double S=pi-a+sin(a)*cos(a); printf("%.5f\n",S/cos(t)); } }
           ^