View Compilation Error

0_0_17070305_24548.cpp:2:11: error: '::main' must return 'int'
 void main()
           ^
0_0_17070305_24548.cpp: In function 'int main()':
0_0_17070305_24548.cpp:5:21: error: 'n' was not declared in this scope
  while((scanf("%d",&n)!=EOF)&&(n!=0))
                     ^
0_0_17070305_24548.cpp:13:13: error: 'm' was not declared in this scope
     sum=sum+m;
             ^
0_0_17070305_24548.cpp:17:1: error: expected '}' at end of input
 }
 ^
0_0_17070305_24548.cpp:17:1: error: expected '}' at end of input