View Compilation Error

0_0_21365457_5689.cpp: In function 'int main()':
0_0_21365457_5689.cpp:7:13: error: 'a' was not declared in this scope
  while(cin>>a>b)
             ^
0_0_21365457_5689.cpp:7:15: error: 'b' was not declared in this scope
  while(cin>>a>b)
               ^