View Compilation Error

0_0_23928569_9219.cpp:3:10: error: expected ')' before ';' token
     int a;
          ^
0_0_23928569_9219.cpp:6:5: error: expected unqualified-id before 'while'
     while(scanf("%d%d",&a,&b)!=EOF)
     ^
0_0_23928569_9219.cpp:10:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_23928569_9219.cpp:11:1: error: expected declaration before '}' token
 }
 ^