View Compilation Error

0_0_37278364_30225.cpp: In function 'int main()':
0_0_37278364_30225.cpp:10:26: error: 'a' was not declared in this scope
 ; while (scanf("%d %d", &a, &b)!=EOF)
                          ^
0_0_37278364_30225.cpp:10:30: error: 'b' was not declared in this scope
 ; while (scanf("%d %d", &a, &b)!=EOF)
                              ^
0_0_37278364_30225.cpp:23:4: error: expected ';' before '}' token
    }
    ^