View Compilation Error

0_0_16206304_11964.cpp: In function 'int main()':
0_0_16206304_11964.cpp:5:30: error: 'A' was not declared in this scope
         while(scanf("%d %d",&A,&B)!=EOF
                              ^
0_0_16206304_11964.cpp:5:33: error: 'B' was not declared in this scope
         while(scanf("%d %d",&A,&B)!=EOF
                                 ^
0_0_16206304_11964.cpp:6:9: error: expected ')' before '{' token
         {
         ^