View Compilation Error

0_0_19373572_26075.cpp:2:11: error: '::main' must return 'int'
 void main()
           ^
0_0_19373572_26075.cpp: In function 'int main()':
0_0_19373572_26075.cpp:4:2: error: 'nbsp' was not declared in this scope
     int n,i,sum;
  ^