View Compilation Error

0_0_23928548_30131.cpp:3:11: error: 'b' has not been declared
     int a,b;
           ^
0_0_23928548_30131.cpp:3:12: error: expected ')' before ';' token
     int a,b;
            ^
0_0_23928548_30131.cpp:5:5: error: expected unqualified-id before 'while'
     while(scanf("%d%d",&a,&b)!=EOF)
     ^
0_0_23928548_30131.cpp:9:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_23928548_30131.cpp:10:1: error: expected declaration before '}' token
 }
 ^