View Compilation Error

0_0_14753939_3495.cpp: In function 'int main()':
0_0_14753939_3495.cpp:5:21: error: 'A' was not declared in this scope
 while(scanf("%d%d",&A,&B)!=EOF) 
                     ^
0_0_14753939_3495.cpp:5:24: error: 'B' was not declared in this scope
 while(scanf("%d%d",&A,&B)!=EOF) 
                        ^