View Compilation Error

0_0_15309477_23370.cpp: In function 'int main()':
0_0_15309477_23370.cpp:7:24: error: 'A' was not declared in this scope
    while(scanf("%d%d",&A,&B)!=EOF)
                        ^
0_0_15309477_23370.cpp:7:27: error: 'B' was not declared in this scope
    while(scanf("%d%d",&A,&B)!=EOF)
                           ^