View Compilation Error

0_0_33141431_30565.cpp:3:11: error: '::main' must return 'int'
 void main()
           ^
0_0_33141431_30565.cpp: In function 'int main()':
0_0_33141431_30565.cpp:5:14: error: 'm' was not declared in this scope
  int a,b,n,j[m],i;
              ^
0_0_33141431_30565.cpp:10:3: error: 'j' was not declared in this scope
   j[i]=a+b;
   ^
0_0_33141431_30565.cpp:15:15: error: 'j' was not declared in this scope
   printf("%d",j[i]);
               ^