View Compilation Error

0_0_15307703_22708.cpp: In function 'int mian()':
0_0_15307703_22708.cpp:3:22: error: 'a' was not declared in this scope
 {while(scanf("%d%d",&a,&b);!=EOF)
                      ^
0_0_15307703_22708.cpp:3:25: error: 'b' was not declared in this scope
 {while(scanf("%d%d",&a,&b);!=EOF)
                         ^
0_0_15307703_22708.cpp:3:27: error: expected ')' before ';' token
 {while(scanf("%d%d",&a,&b);!=EOF)
                           ^
0_0_15307703_22708.cpp:3:28: error: expected primary-expression before '!=' token
 {while(scanf("%d%d",&a,&b);!=EOF)
                            ^