View Compilation Error

0_0_38423395_8460.cpp:11:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_38423395_8460.cpp: In function 'int main()':
0_0_38423395_8460.cpp:13:15: error: return-statement with no value, in function returning 'int' [-fpermissive]
 if(n<0||n>50) return;
               ^