View Compilation Error

0_0_30159188_18877.cpp: In function 'int cal(int, int)':
0_0_30159188_18877.cpp:17:11: error: a function-definition is not allowed here before '{' token
 int main(){
           ^
0_0_30159188_18877.cpp:35:1: error: expected '}' at end of input
 }
 ^