View Compilation Error

0_0_13489532_2323.cpp:2:11: error: '::main' must return 'int'
 void main()
           ^
0_0_13489532_2323.cpp: In function 'int main()':
0_0_13489532_2323.cpp:5:47: error: expected primary-expression before ')' token
  while(scanf("%d%d",&n,&m)!=EOF && m!=0&&n!=0)){
                                               ^