View Compilation Error

0_0_33323198_27376.cpp: In function 'int fan(int, int)':
0_0_33323198_27376.cpp:12:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
         return ;
         ^
0_0_33323198_27376.cpp:16:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
         return ;
         ^