View Compilation Error

0_0_24213647_18412.cpp:5:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_24213647_18412.cpp: In function 'int main()':
0_0_24213647_18412.cpp:9:4: error: return-statement with no value, in function returning 'int' [-fpermissive]
    return;
    ^